Qiaohua QH-912-2T Transmitter of Wireless Door Chime Kit User Manual
SHENZHEN QIAOHUA INDUSTRIES LIMITED Transmitter of Wireless Door Chime Kit
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User Manual
It is very important to install and operate this product according to the following instructions.
Failure to do so may render your guarantee void.
Accessories List
The door chime kit comes with:
● 1 x Receiver ● 2 x Transmitters
● 2 x CR2032 Battery ● 2 x Double-sided adhesive
● 1 x Instruction Manual
Pictures for Accessories:
(1) Melody Selector (2) Hanging Hole (3) Speaker
(4) Battery Cover (5) Push Button (6) Decoration only
(7) Front cover and back cover hook
(8) Standby holes for screws (9) Interface
Notes before Installation
1. Before installation and operation, you will require a drill, a cross-headed screwdriver, a flat head
screwdriver, 2xAA 1.5V size batteries, fixing screws and wall plugs. All of these are not supplied
with this kit.
2. Avoid the Transmitter positioning on Metal Frames.
3. Avoid positioning above heat sources such as radiators, or in damp areas such as a kitchen or
bathroom.
How to use the door chime kit?
Pressing the Transmitter, a wireless signal will be sent to the Receiver. The Receiver will be activated
and sound. The operating range is 100m ( in the open air ) and you can use the Receiver virtually
anywhere at home (only indoor use). However, the transmission range will be reduced if the signal
is transmitted through a number of walls or ceilings and Metal or UPVC doorframes can also reduce
the operating range.
BatteryBattery Installation
Transmitter Unit
Transmitter uses a 3V CR2032 battery (included).
Open the Transmitter ( by pushing in the interface located at the bottom with a flat screw driver )
and place the battery. Please be well noted with the correct battery polarity. To replace a new battery,
operate in the same way.
Receiver Unit
Remove the battery cover and insert 2×AA 1.5V batteries (not included); Ensure battery polarity
matches the internal markings.
Wall Mount
To install you will require a drill and cross-headed screwdriver.
IMPORTANT: Before you drill any hole in the wall, please make sure there are not cables or pipes
that you may accidentally damage.
Transmitter Unit
1. Open the Transmitter with screw driver and separate the front cover from the back cover, as
mentioned before. Penetrate the two standby holes at the back cover with two screws. Then fix
the screws on the wall at suitable height. Mounting on UPVC or metal doorframe surfaces will
reduce the transmitting range. (As picture 1)
2. Or you can stick the Transmitter with the double-sided adhesive tape. (As picture 2)
Note: This door chime kit is designed mainly for front door and back door use. Please mount one
transmitter at the front door and one at the back door. Of course you can mount the two
transmitters anywhere according to your exact need.
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Specification
● Battery Voltage：Receiver: DC3V(AA1.5Vx2)
● transmitter: DC3V( CR2032)
● Current for receiver： quiescent current<200UA. working current<150MA
● can use about nine month when sounds about ten times everyday
● Current for transmitter: quiescent current<5UA; Working current: <15MA
● If press ten times a day it can use about one year
● Frequency：433.92MHz
● Receiver Sensitivity：<-110dbm
● transmitter power：<10mw
● Volume grade：>80dbA (testing within 0.5m)
● Modulation type：ASK
● transmitting distance in the open area：150M
What is Pre-set Code?
There is a transmitting code between Transmitter and the Receiver. During production,
manufacturer has fixed the code which can not be changed by any user out of the factory.
This means, the Transmitter can only work with the Receiver in the same kit.
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 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 off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
● Reorient 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.
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 received, including interference that may cause undesired operation.
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Receiver Unit
Fix a screw on the wall. Then hang the Receiver by the hole at the back
of the unit. Avoid positioning on UPVC Frames, above heat sources
(e.g. radiator) or in damp areas such as a kitchen or bathroom.
Important: Test the Receiver before drilling any holes to ensure it is
within operating range.
Note: As an alternative, the Receiver can also be placed on the flat surface, such as table.
Functions Instruction
Door Chime Operation
Press the push button on the Transmitter unit once, it sends a wireless signal to the Receiver which
will sound. The sound will stop as soon as the melody ends. For repeat sound, press the button again.
Hold the button in will NOT repeat the sound.
Dierent Melodies for the Two Transmitters
There are two built-in melodies with the Receiver. The Receiver will sound with different melodies
to response to different signals sent from the two Transmitters. As a reminder, you can not select
the two built-in melodies.
Important
1. Receiver is designed for indoor use only.
2. Do not mount the Transmitter onto any metal surface or UPVC doorframes, as this will reduce the
operation range.
3. Do not expose either unit directly to rain or immerse in water.
4. Do not mount either unit close to fireplace or expose to high temperature.
5. If leaving the chime for long periods, remove the battery from compartment to prevent leakage.
6. Dispose of old batteries in accordance with the relevant legislation.
User Hints
If the Receiver does not sound, please check the following:
1. Flat batteries in either Transmitter or Receivers-change the batteries.
2. Wrong battery polarity in either Transmitter or Receivers-reinsert the batteries.
3. Units are out of range-Operate the Receiver within the operation range.
Model NO: QH-912-2
WIRELESS DOOR CHIME KIT INSTRUCTION MANUAL
Front Door and Back Door Door Chime
Names for Parts
Receiver front side Receiver back side
(1) (2)
(3)
(4)
(7)
(9)
Transmitter front
cover outside
Transmitter back
cover inside
(6)
(5)
(8)
Receiver
2x1.5V AA
Alkaline Battery
CR2032 3V
Lithium Battery
Receiver Transmitter Double-side
adhesive
Instruction ManualCR2032 Battery
Warning: Changes or modifications to this unit not expressly approved by the
party responsible for compliance could void the user authority to operate the
equipment.