Operating instruction of SD251-BT/BT251-BK
I. Functions of keys
Power On: Press center key for 3 seconds
Power Off: Press center key for 3 seconds
Volume Up: Short press "+" key
Volume Down: Short press "-" key
Next Track: Long press "+" key.
Previous Track: Long press "-" key
Play the Track: Press "center" key once
Pause the Track: Press "center" key once
Answer incoming call: Press "center" key once
Refuse incoming call: Press "center" key twice
End the call: Press "center" key once
Last number Redial: Press "center" key twice
Activate Siri: Press "center" key thrice
MIC: Microphone
USB: micro USB charging port
II. Charging
The Bluetooth headset has a built-in rechargeable battery and the battery power of a new headset is not
enough; please charge for at least 1.5 hours to make the battery power enough before the first use. Hereafter,
charging will take about 1 hour. While it is charging, the red light is on; while the charging is saturated, the red
light will be off .
III. Pairing of headset and Bluetooth device
The Bluetooth headset must be paired with your mobile phone (or other Bluetooth devices) before use.
1. When the headset is in power-off state, please press center key to power on, will hear the voice prompt
“power on “ and ”pairing”.
2. Search the Bluetooth device on your Bluetooth headset (please refer to the mobile phone instructions for
detailed process). When the search is finished, you will find a new device called "SD251-BT" in the device list.
3. Select SD251-BT which will be automatically paired and connected with mobile phone; when the pairing
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