Huey Chiao HCB20 - Manual (Page 5)

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3. Product Introduction
Function (Answering/ Ending/ On/ Off) Button 3
LED (Indicator) Light
Receiver (Speaker)
Microphone
Power Interface adapter (charging)
Ear Hook
Decrease Volume key (-) 
Increase Volume key (+) 2
Note:
● For first time use, make sure to fully recharge the Headset bat-
tery.
4. Charging the Headset
HCB20 comes with a Lithium Polymer battery built-in.