SHI KISB Electronic BTK-A21 BLUETOOTH HEADSET User Manual
Shenzhen SHI KISB Electronic Co., Ltd. BLUETOOTH HEADSET
USERS MANUAL

1
BTK-A21 Bluetooth Headset User Manual 
Thank you for purchasing the Mini Bluetooth Headset BTK-A21, we hope you 
will be delighted with its operation. 
Please read this user's guide to get started, and to make the best use of the 
headset's many features. 
Driving safety 
1. When you are driving a car, driving is your first responsibility. 
2. When using your headset while driving, follow local regulations in the country 
or region you are in. 
BEFORE USING YOUR HEADSET 
Checking phone compatibility 
Your headset is compatible with most Bluetooth phones that are compliant with 
Bluetooth version 2.0 and support the headset and/or hands- free profile(s). 
Ensure that your phone has Bluetooth capability by visiting your phone 
manufacturer's web Site.  
Your headset overview 
K1 Button: Turn on/ Turn off/ Pairing/ Answer/ End/ Voice Dial/ Reject/ Change 
Conversation Mode 
K2 Button: Increase Volume 
2
K3 Button: Decrease Volume/ Redial 
Checking the accessories 
Make sure you have the following items with your headset: Travel adapter, 
Manual, Ear-hook. 
Charging the headset 
Your headset uses a rechargeable battery. You must charge the battery fully 
before using the headset for the first time. 
Simply plug in provided USB cable to charging socket then to USB Car Charger 
Adaptor / Notebook Computer / Desktop Computer. Headset will start charging. 
The red indicator of headset will turn on when charging. When the battery is full, 
the red indicator of the headset will turn off.  
1) Charge the headset until the red light on the headset turn off. 
2) The headset will be fully charged in approximately 1 hour. 
3) Remove the USB cable from the charging socket. . 
IMPORTANT: The headset cannot be used while charging. 
BASIC OPERATIONS 
Turning headset on/off 
1. To turn the headset on 
Press and hold K1 Button for about 3 seconds, the blue indicator of the headset will flash 3 
times rapidly. The headset is now turned on.  
2. To turn the headset off 
Press and hold K1 Button for about 3 seconds, the red indicator will flash 5 times 
rapidly. The headset will turn off. 
3. When the blue indicator changes to the red indicator if the headset turned on, 
it means the headset energy is not enough, please charge the headset quickly.  
Pairing  
Pairing will create a unique and encrypted wireless link between two Bluetooth 
enabled devices, such as your Bluetooth phone and Bluetooth headset. 
1.  Ensure that the headset is off (see Turning headset on/off section). 
2. Press and hold the K1 Button for about 4 seconds until the indicator light 
alternately flashes blue and red. 
3
3. Set your Bluetooth phone to discover the headset by following your phone's 
guide. Typically, the steps involve going to a ‘Setup’, 'Connect', or  ‘Bluetooth’ 
menu on your phone and then selecting the option to discover Bluetooth devices. 
4.  Your phone will find the  “BTK-A21” headset and ask if you want to pair 
with it. Confirm this by pressing the “Yes” or “OK” key. 
5.  Enter a passkey or PIN code “0000” (4 zeros), then press the “Yes” or “OK” 
key. 
IMPORTANT: If the pairing can’t be completed within 90 seconds while the 
pairing mode is activated, that meant the pairing was unsuccessful, please repeat 
Step 1 to Step 5 to pair the headset and the mobile phone again.  
Wearing the headset 
Wear the headset on your ear. In general, you will get better performance when 
there are no obstructions (including parts of your body) between the headset and 
the phone. Depending on what ear you are going to wear the headset, simply 
adjust the ear-hook accordingly.  
Making a call 
If headset is off, turn it on now (see Turning headset on/off section). 
Using the phone’s keypad. 
1. Dial number with keypad. 
2. Press phone’s “send” key. 
Using voice-activated dialing (after you’ve set up voice tags on your phone) 
If your mobile phone is equipped with a dialing function, you can make a voice activated 
call. 
1. Short press K1 Button once. 
2. You’ll then hear the voice-activation tone, say the name of the person you wish to call. 
3. Short press K1 Button to stop the voice dialing. 
Ending a call 
l  Short press K1 Button once 
OR 
4
l  End call from phone’s keypad 
Answering a call 
l  After you hear the ring tone, short press K1 Button once 
OR 
l  Answer the call with your phone’s keypad. You may then need to transfer the call to the 
headset by pressing the K1 Button twice (depending on your phone). 
Last number redial 
When the headset is on, press and hold K3 Button for 3 seconds and then release. 
Rejecting an incoming call  
When you receive a call, press and hold K1 Button for 2 seconds to reject the call.   
Adjusting the volume 
Press K2 Button to increase the volume level and press K3 Button to decrease the volume 
level. 
Change Conversation Mode 
Press K1 Button twice to change the conversation mode between headset and 
mobile phone during the call. 

5
Storage of the headset 
1. Always store the headset with the power off and make sure it is safely 
protected. 
2. Avoid storage at high temperatures (above 60℃) such as in a hot vehicle or in 
direct sunlight. (Storage at high temperatures can damage performance and 
reduces battery life). 
3. Do not expose the headset or any of its supplied parts to rain or other liquids. 
Product Specifications 
Bluetooth Compliance: Bluetooth Version V2.0+EDR Specifications, Class II 
Supported Bluetooth Profiles: Bluetooth Headset & Hands-free Profiles 
Operating Range: Up to 30 feet (10 meters) 

6
Frequency: 2.40~2.48GHz 
Talk Time: Up to 6~8 hours* 
Standby Time: Up to 120 hours* 
Charging Time: About 1 hour 
Battery Type: Rechargeable Lithium Polymer battery 
Dimensions (L X W X T): 39 x 16 x 11(mm)  
Weight: 6.5g (excluding accessories) 
*Depending on the phone type and usage, the actual time may vary. 
Correct disposal of this product 
 (Waste Electrical & Electronic Equipment)This marking shown on the 
product or its literature, indicates that it should not be disposed with other 
household wastes at the end of its working life. 
To prevent possible harm to the environment or human health from uncontrolled 
waste disposal, please separate this from other types of wastes and recycle it 
responsibly to promote the sustainable reuse of material resources. Household 
users should contact either the retailer where they purchased this product, or 
their local government office, for details of where and how they can take this 
item for environmentally safe recycling. Business users should contact their 
supplier and check the terms and conditions of the purchase contract. This 
product should not be mixed with other commercial wastes for disposal. 
Bluetooth® is a trademark owned by Bluetooth SIG, Inc. 
7
FCC Information 
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. 
Federal Communications Commission (FCC) Statement 
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. 
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. 
Tested to comply with FCC standard. FOR HOME OR OFFICE USE. 
Warning : 
This equipment complies with FCC RF radiation exposure limits set forth for an 
uncontrolled environment. & This device and its antenna(s) must not be 
co-located or conjunction with any other antenna or transmitter.