Samsung Electro Mechanics ST-GM42001 ESL Graphic TAG User Manual

Samsung Electro Mechanics ESL Graphic TAG

User Manual

 Preliminary REV 1.0 Samsung Electro  CUSTOMER APPROVAL SHEETCompany NameMODEL CUSTOMER APPROVAL APPROVAL FOR SPECIFICATIONS ONLY (Spec. Ver. CUSTOMER REMARK :   Issued ByIH Jo    150, Maeyoung-ro(Maetan S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidential  CUSTOMER APPROVAL SHEET  Company Name  ST-GM4200  APPROVAL FOR SPECIFICATIONS ONLY (Spec. Ver. 1.0CUSTOMER REMARK : Issued By  Checked By Approved ByIH Jo  GY Byun  JG Ryu Samsung Electro-Mechanics Maetan3-Dong), YoungTong-Gu, Suwon, GyeonTel : 82-31-210-5114 TAG Datasheet(ST-GM42001) Proprietary and Confidential 1/21 CUSTOMER APPROVAL SHEET 001 1.0 ) Approved By eonggi-Do, Korea
 Preliminary REV 1.0 Samsung Electro  S-TAG Datasheet S-Label (Electronic Label System) REV 1.0    Samsung Electro-Mechanics  2014-12-16    Summary This datasheet presents the general performance and specifications of Shelf Label) system, which is based on     S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialDatasheet  Label (Electronic Label System) general performance and specifications of S-Tag for based on IEEE 802.15.4. © 2014 Samsung Electro-Mechanics.  All rights reservedThe names  of  actual  companies and products  mentioned herein may be the trademarks of their respective owners.No  part  of  this  document  may  be  reproduced,  stored  in  a retrieval  system,  or  transmitted  in  any  form  or  by  any  means without  the  express  written  consent  of  Samsung  ElectroMechanics. This document is subject to change without notice.TAG Datasheet(ST-GM42001) Proprietary and Confidential 2/21 for S-Label ESL (Electronic Mechanics.  All rights reserved and products  mentioned  herein may be the trademarks of their respective owners. No  part  of  this  document  may  be  reproduced,  stored  in  a retrieval  system,  or  transmitted  in  any  form  or  by  any  means without  the  express  written  consent  of  Samsung  Electro-This document is subject to change without notice.
 Preliminary REV 1.0 Samsung Electro  Table of Contents  1 GENERAL DESCRIPTION 1.1 FEATURES ................................1.2 TYPICAL APPLICATIONS ................................1.3 APPEARANCE ................................2 SPECIFICATION ................................2.1 PRODUCT SPECIFICATION ................................2.2 RADIO (RF) SPECIFICATION2.3 MECHANICAL DRAWING ................................2.4 LABELS ................................2.5 BARCODE SCANNING ................................3 OPERATION TEST ................................4 ESL OPERATION BY DISPLAY5 PACKAGE ................................6CAUTIONS FOR TREATME6.1 USAGE ENVIRONMENT ................................6.2 STORAGE AND USE ................................6.3 FCC ................................        S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidential ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................PECIFICATION ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................PLAY ................................................................................................................................................................CAUTIONS FOR TREATMENT................................................................................................................................................................................................................................................................................................................................................................TAG Datasheet(ST-GM42001) Proprietary and Confidential 3/21 ..................................... 5......................................................... 6......................................... 6...................................................... 7.................................................. 8....................................... 8................................... 8......................................... 9............................................................ 11............................................ 13.............................................. 14........................................................... 15........................................................... 18............................................................. 19.......................................... 19.............................................. 19............................................................... 20
 Preliminary REV 1.0 Samsung Electro    Document History   Rev.  Date 1.0  16 Dec 014    Initial release                  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialRevision history Initial release  TAG Datasheet(ST-GM42001) Proprietary and Confidential 4/21 Page -
 Preliminary REV 1.0 Samsung Electro  1 General Description  This  S-Tag product  is  a  part  of  Samsung  SGateway  (S-Gate),  Remote  controllerdisplays price and other product information on paper in places like retail markets. S-Tag receives product price/information updates from and other information.   S-Tag is  the  product  based  on  IEEE  standard  802.15.4applications.  S-Tag consists  of  RF  transceiver,  RF  circuitry  and 802.15.4 based network protocol and MAC protocol and other peripheral devices.   S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialDescription product  is  a  part  of  Samsung  S-Label  (Electronic  Shelf  Label)  system  as  well  as  S,  Remote  controller  (S-RC).  S-Label  system  make  up  a  system  that  electronically displays price and other product information on S-Tags, which has been traditionally printed or written on paper in places like retail markets. receives product price/information updates from S-Gate and updates or changesis  the  product  based  on  IEEE  standard  802.15.4 for  low  power  wireless  communication consists  of  RF  transceiver,  RF  circuitry  and ARM  Cortex  M3802.15.4 based network protocol and MAC protocol and other peripheral devices. Figure 1   ESL System TAG Datasheet(ST-GM42001) Proprietary and Confidential 5/21 Label  (Electronic  Shelf  Label)  system  as  well  as  S-Label Label  system  make  up  a  system  that  electronically traditionally printed or written on changes its display of price for  low  power  wireless  communication ARM  Cortex  M3  MCU  offering  IEEE
 Preliminary REV 1.0 Samsung Electro  1.1 Features  - Display : E-Paper Display- Display Resolution : 400- Communication : Wireless communication based - Operating on 2.4GHz Unlicensed ISM band for ZigBee- Low Power Consumption- External Wakeup : Magnetic Wakeup (using Reed switch)- Outline Dimension : 103- Working condition: Indoor where wireless communication is  1.2 Typical Applications - Retail industry with electronic display- Intelligently communicating, managing, and optimizing price and product informations.             S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidentialisplay (EPD) (active  type) (84.80 x 63.60 mm) 400 x 300 pixel (120dpi) Communication : Wireless communication based on IEEE 802.15.4 Operating on 2.4GHz Unlicensed ISM band for ZigBee Low Power Consumption Magnetic Wakeup (using Reed switch) 3.46 mm x 87.43 mm x 14.5 mm Working condition: Indoor where wireless communication is available. Applications Retail industry with electronic displays, platforms, solutions and services.Intelligently communicating, managing, and optimizing price and product informations.TAG Datasheet(ST-GM42001) Proprietary and Confidential 6/21 . Intelligently communicating, managing, and optimizing price and product informations.
 Preliminary REV 1.0 Samsung Electro  1.3 Appearance     S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidential      Figure 2   Appearance TAG Datasheet(ST-GM42001) Proprietary and Confidential 7/21
 Preliminary REV 1.0 Samsung Electro  2 Specification  2.1 Product Specification Item Size Battery Display Housing Color Information display Communication Communication Distance Operation Temp. Etc.  2.2 Radio (RF)1 Specification Item Parameter TX Transmit Power Error Vector MagnitudeTx Current RX Receiver Sensitivity                                                1 Test Channel : 2480MHz  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialSpecification Description 103.46 mm x 87.43 mm x 14.5 mm CR2450 Lithium Battery (3V, 3PCS) 2.4 ~ 3.3Vdc (condition : In active status) Electrical paper display (active type) (84.80 x 63.60Display Resolution : 400 x 300 pixel White Price, Unit, Symbol etc. Wireless communication based on IEEE 802.15.4Radius 20m ( Line of Sight) 0 ~ 40   (@20~60% RH) No additional anti-theft locking structure : Rail Mounted onlySpecification SPEC Unit ConditionMin Typ Max  -4 1 6 dBm Error Vector Magnitude - 10 30 % When measured for 100 chips - 35 mA Total current at max Tx PowerReceiver Sensitivity -90 - - dBm PER <        TAG Datasheet(ST-GM42001) Proprietary and Confidential 8/21 63.60 mm) Wireless communication based on IEEE 802.15.4 theft locking structure : Rail Mounted only Condition  When measured for 100 chips Total current at max Tx Power PER < 1%
 Preliminary REV 1.0 Samsung Electro  2.3 Mechanical Drawing 2.3.1 Case Dimension  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialMechanical Drawing  Figure 3 Mechanical Dimension  TAG Datasheet(ST-GM42001) Proprietary and Confidential 9/21
 Preliminary REV 1.0 Samsung Electro  2.3.2 Exploded View         S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidential Figure 4 Exploded View TAG Datasheet(ST-GM42001) Proprietary and Confidential 10/21
 Preliminary REV 1.0 Samsung Electro  2.4 Labels  2.4.1 Serial Number Information    Serial 1, 2 Code Value   14  3 G       Year : Last two digits of manufacturing year.              (00 ~ 99, Example : 201 Month : Manufacturing m   (1 ~ 9, X(10), Y(11), Z(12)) Date : Manufacturing da    (1 ~ 9, A(10) ~ V(31)) Vendor : Manufacturing     (S : SEMTHAI, T : TSEM, etc Line number : Manufactu    ('A', 'B', 'C', etc)  Revision : Product revision number    (A : First, B : Second, C : Third, etc ZigBee IC Lot Number : Last 3 characters       S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidentialnformation Serial 1, 2 Code Value G  S  A  A  2JW          Year : Last two digits of manufacturing year.  xample : 2014 is '14') ing month (1 ~ 9, X(10), Y(11), Z(12)) g date (1 ~ 9, A(10) ~ V(31)) ring vendor : SEMTHAI, T : TSEM, etc) facturing Line number  Revision : Product revision number A : First, B : Second, C : Third, etc ) : Last 3 characters TAG Datasheet(ST-GM42001) Proprietary and Confidential 11/21
 Preliminary REV 1.0 Samsung Electro  2.4.2 Product and Mac Label Drawing   Product  information  is  indicated  in  a  printed  sticker  label.  The  information  consists  of  MODEL  (model name), MFD (manufacturing date), S/N (serial number), MAC (MAC address), CE certification mark, ID and Manufacture (SEMCO).  1) Model Name : ST-GM422) MFD : (Month).(Date).(Year) 3) S/N : Serial Number Information4) MAC : barcode & barcode number(hexadecimal 1           - 6 digits (1st ~ 6th) : xxxxxx (Company code)- 6 digits (7th ~ 1           - 4 digits (13th ~ 1     S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialMac Label Drawings Figure 5  Product and Mac Labels Product  information  is  indicated  in  a  printed  sticker  label.  The  information  consists  of  MODEL  (model name), MFD (manufacturing date), S/N (serial number), MAC (MAC address), CE certification mark, 42001 MFD : (Month).(Date).(Year)    ex) May.16.2014 Serial Number Information barcode number(hexadecimal 16 digits) 6 digits (1st ~ 6th) : xxxxxx (Company code) digits (7th ~ 12th) : xxxxxx (Increasing number : 000000 ~ FFFFFF)th ~ 16th) : 4201 TAG Datasheet(ST-GM42001) Proprietary and Confidential 12/21  Product  information  is  indicated  in  a  printed  sticker  label.  The  information  consists  of  MODEL  (model name), MFD (manufacturing date), S/N (serial number), MAC (MAC address), CE certification mark, FCC (Increasing number : 000000 ~ FFFFFF)
 Preliminary REV 1.0 Samsung Electro  2.5 Barcode Scanning 2.5.1 Barcode Scanning ConditionTypically Scan distance is 8 ~ 9cm and angle is horizontality Example)   <Horizontality>                                                          <  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialBarcode Scanning Barcode Scanning Condition Typically Scan distance is 8 ~ 9cm and angle is horizontality <Horizontality>                                                          <TAG Datasheet(ST-GM42001) Proprietary and Confidential 13/21 >
 Preliminary REV 1.0 Samsung Electro  3 Operation Test It will be updated before 2nd release. Below is just a sample.  Equipments : Gateway (S Target DUT : EPD TAG    Test Scenario  Install Tag on Jig  Ready to Gateway(S wake up Tag with R/C Tag start to communicate with Gateway  Tag display the numeric information received from Gateway Check Tag(EPD display  Wake up Tag with R/C Check Tag(EPD display(blank display))  Criterion (Below both Good : You can see ‘Black’  Compare MAC address with that of label attached to  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidentialrelease. Below is just a sample. (S-Gate), R/C (S-TAG), Jig for power supply   Figure 6  Operation Test Ready to Gateway(S-Gate) and R/C wake up Tag with R/C Tag start to communicate with Gateway  Tag display the numeric information received from Gateway Check Tag(EPD display status & MAC address value) Wake up Tag with R/C Check Tag(EPD display(blank display)) both two conditions should be all satisfied) You can see ‘Black’  ‘White’ display Compare MAC address with that of label attached to Front or Back plane.TAG Datasheet(ST-GM42001) Proprietary and Confidential 14/21 or Back plane.
 Preliminary REV 1.0 Samsung Electro  4 ESL Operation by displayIt will be updated before 2nd release.Display  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidentialby display release. Below is just a sample. State User Action STATE: 1  Initial display when shipped from the manufacturer (Blank display). None  STATE: 1  No change. To assign a tag  STATE 1  2  Searching for GWs (MAC address, tag version and triangle). A tag woken up by an RC STATE 2  4  A tag is connected to a GW and received price (Price) None TAG Datasheet(ST-GM42001) Proprietary and Confidential 15/21 User Action  To assign a tag using a PDA A tag woken up by an RC
 Preliminary REV 1.0 Samsung Electro   S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidential STATE 2  3  A tag failed to locate a GW (blank).   STATE 4  5 When a tag is connected to a GW, and woken up by an RC, Next page display predefined. Display is end, tag wait 10 second wakeup signal by RC. When signal is detected in this time, immediately return first Page and Send Price Request to GW. No signal in this time, after 10 second return first Page and Same Operation. Woken up by an RC STATE 4  6  Connection to a GW is lost  (price  and Rectangle on upper right corner) None  STATE 6  6 When connection is lost and woken up by an RC (blinks with the price and Rectangle) Starts to search GWs. Woken up by an RCTAG Datasheet(ST-GM42001) Proprietary and Confidential 16/21 Woken up by an RC  Woken up by an RC
 Preliminary REV 1.0 Samsung Electro    S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidential STATE 4  1 Initial display (Blank display). To clear an assigned tag using a PDATAG Datasheet(ST-GM42001) Proprietary and Confidential 17/21 To clear an assigned tag using a PDA
 Preliminary REV 1.0 Samsung Electro  5 Package    S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialTAG Datasheet(ST-GM42001) Proprietary and Confidential 18/21
 Preliminary REV 1.0 Samsung Electro  6 Cautions for Treat  Provisions should be made to protect against any damage to the product caused by improper handling.  It is highly recommended that the product should be installed within the logistics hub. Recommended storage conditio This RF device operates on the 2.4GHz frequency band and can produce radio interference. The device, therefore, may not be used for applications where safety of human lives is concerned. 6.1 Usage Environment  Take extra cautions when using this RF device in the vicinity of other electronic devices and appliances. Most electronic devices and appliances use electromagnetic waves. Electromagnetic waves emitted by this RF device can affect other electronic devices and appliances. If using the device in an explosion hazard area, follow all safety regulations, instructions, and signals. 6.2 Storage and Use   Moisture and liquids can damage internal parts and circuit boards if allowed to enter into the devicitself.  Do  not  place  or  store  the  product  on  a  sloped  surface.  The  product  may  slide  and  fall  off  the surface and damaged.  Use the product in temperatures ranging from used or stored under temperature extremes. The display panel needs extra care when handling.- Do not apply any impacts on outside since e- Continuous  exposure  to  excessive  moisture  (over  60%  RH)  or  UV  makes  display  lifetimeshortened. - Ghosting image may be appeared in temperature conditions of less than 15 Celsius degree. Avoid areas with strong magnetism or subject to magnetism.Contact between the device and a magnetic object can lead to malfunctions. Do not place the product  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidentialautions for Treatment Provisions should be made to protect against any damage to the product caused by improper handling. It is highly recommended that the product should be installed within 3 months from the date of . Recommended storage condition is in 0-40 Celsius degree, 20-60% RH environment. This RF device operates on the 2.4GHz frequency band and can produce radio interference. The device, therefore, may not be used for applications where safety of human lives is concerned.Environment when using this RF device in the vicinity of other electronic devices and appliances. Most electronic devices and appliances use electromagnetic waves. Electromagnetic waves emitted by this ronic devices and appliances. If using the device in an explosion hazard area, follow all safety regulations, instructions, and signals.Moisture and liquids can damage internal parts and circuit boards if allowed to enter into the devicDo  not  place  or  store  the  product  on  a  sloped  surface.  The  product  may  slide  and  fall  off  the Use the product in temperatures ranging from 0  to +40. Parts and circuits may used or stored under temperature extremes. The display panel needs extra care when handling. Do not apply any impacts on outside since e-Paper display is fragile. Continuous  exposure  to  excessive  moisture  (over  60%  RH)  or  UV  makes  display  lifetimeGhosting image may be appeared in temperature conditions of less than 15 Celsius degree.Avoid areas with strong magnetism or subject to magnetism.  Contact between the device and a magnetic object can lead to malfunctions.Do not place the product near heat-producing kitchen appliances like a stove or a microwave or in TAG Datasheet(ST-GM42001) Proprietary and Confidential 19/21 Provisions should be made to protect against any damage to the product caused by improper handling.  3 months from the date of arrival in 60% RH environment.  This RF device operates on the 2.4GHz frequency band and can produce radio interference. The device, therefore, may not be used for applications where safety of human lives is concerned. when using this RF device in the vicinity of other electronic devices and appliances. Most electronic devices and appliances use electromagnetic waves. Electromagnetic waves emitted by this If using the device in an explosion hazard area, follow all safety regulations, instructions, and signals. Moisture and liquids can damage internal parts and circuit boards if allowed to enter into the device Do  not  place  or  store  the  product  on  a  sloped  surface.  The  product  may  slide  and  fall  off  the . Parts and circuits may be damaged if  Continuous  exposure  to  excessive  moisture  (over  60%  RH)  or  UV  makes  display  lifetime Ghosting image may be appeared in temperature conditions of less than 15 Celsius degree. Contact between the device and a magnetic object can lead to malfunctions. producing kitchen appliances like a stove or a microwave or in
 Preliminary REV 1.0 Samsung Electro  the vicinity of highly pressurized containers. External  impact to the product, such as from  being dropped, can damage  the casing can be separated.  Twisting and bending the product can damage the exterior casing and the internal components. If  this  product  operates  abnormally  in  eliminating  battery  vinyl  or  replacing  battery,  you  should discharge it by contacting battery terminal (+) and ( This  product  uses  2.4GHz  frequency  band  for  wireless  communication  network.  Radio communications can be limited or affected by other applications which share same frequency band, such as WiFi, Bluetooth, Zigbee, etc. Frequent communications, updates and sc 6.3 FCC  FCC ID : E2X-ST-GM42001  WARNING  : This  equipment  may  generate  or  use  radio  frequency  energy.  Changes  or  modifications  to this  equipment  may  cause  harmful  interference  unless  the  modifications  are  expressly  approved  in  the instruction manual. The user could lose the authority to operate thor modification is made.  This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)  This  device  may  not  cause  harmful  interference,  and  (2)  this  device  must  accept  areceived, Including interference that may cause undesired operation. NOTE : This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed toharmful  interference  in  a  residential  installation  This  equipment  generates,  uses  and  can  radiate  radio frequency  energy and, if not installed  and used in accordance with the instructions, may  cause harmful interference to radio communications, However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment othe interference by one or more of the following measures:  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and Confidentialthe vicinity of highly pressurized containers. External  impact to  the  product,  such as from being dropped, can damage  the  ing the product can damage the exterior casing and the internal components.If  this  product  operates  abnormally  in  eliminating  battery  vinyl  or  replacing  battery,  you  should discharge it by contacting battery terminal (+) and (-). This  product  uses  2.4GHz  frequency  band  for  wireless  communication  network.  Radio communications can be limited or affected by other applications which share same frequency band, such as WiFi, Bluetooth, Zigbee, etc. communications, updates and screen renewals may reduce battery life time.This  equipment  may  generate  or  use  radio  frequency  energy.  Changes  or  modifications  to this  equipment  may  cause  harmful  interference  unless  the  modifications  are  expressly  approved  in  the instruction manual. The user could lose the authority to operate this equipment if an unauthorized change This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)  This  device  may  not  cause  harmful  interference,  and  (2)  this  device  must  accept  areceived, Including interference that may cause undesired operation. NOTE : This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful  interference  in  a  residential  installation  This  equipment  generates,  uses  and  can  radiate  radio frequency  energy and, if not installed and used in accordance with the instructions, may  cause harmful ce to radio communications, However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: TAG Datasheet(ST-GM42001) Proprietary and Confidential 20/21 External  impact to the product, such as  from  being dropped, can damage  the product or battery ing the product can damage the exterior casing and the internal components. If  this  product  operates  abnormally  in  eliminating  battery  vinyl  or  replacing  battery,  you  should This  product  uses  2.4GHz  frequency  band  for  wireless  communication  network.  Radio communications can be limited or affected by other applications which share same frequency band, reduce battery life time. This  equipment  may  generate  or  use  radio  frequency  energy.  Changes  or  modifications  to this  equipment  may  cause  harmful  interference  unless  the  modifications  are  expressly  approved  in  the is equipment if an unauthorized change This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)  This  device  may  not  cause  harmful  interference,  and  (2)  this  device  must  accept  any  interference NOTE : This equipment has been tested and found to comply with the limits for a Class B digital device, provide reasonable protection against harmful  interference  in  a  residential  installation  This  equipment  generates,  uses  and  can  radiate  radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful ce to radio communications, However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, ff and on, the user is encouraged to try to correct
 Preliminary REV 1.0 Samsung Electro  - Reorient or relocate the receiving antenna. - Increase the separation between the equipment and receiver. - Connect the equipment into an ou- Consult the dealer or an experienced radio/TV technician for help.  S-TAG Datasheet(STSamsung Electro-Mechanics Proprietary and ConfidentialReorient or relocate the receiving antenna.  Increase the separation between the equipment and receiver.  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. TAG Datasheet(ST-GM42001) Proprietary and Confidential 21/21 tlet on a circuit different from that to which the receiver is connected. Caution This device complies with FCC radiation exposure limits for an uncontrolled environment. Avoid operating this device at a distance less than 20cm form the user.

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