Operation Description
Product specificationProduct model:C-521
Version: 5.2
Battery specifications: Earphone 37V 35mAh; Chargingbin 37V 250mAh-
Supported modes:HFP/HSP/A2DP/AVRCPSensitivity:105D8 3dB SPlat1KHz · Signal distance:10m
(ideal environment without any largeobstacles)Running time:about 3 hours
Talk time: about 35 hours
Standby time: about 80 hours
Charging time: charge the charging box for about 1.5 hoursand charge the headset for about 1
hour
Charging times for earphones in charging bin: about 2.5times
Function Operation Description
1, the bootTake the earphone out of the charging bin andstart it automatically or press the left
and right earphonemulti-function button for 3 seconds to start it.
2 turn it offPut the earphone into the charging bin toautomatically shut down/long press the left
and rightearphone multi-function button for 5 seconds to shut down
3. Start and reconnectAfter the pairing is successful,theBluetooth headset will enter the
connection statepreferentially and automatically return whenit is turned on for the second time
Connect to an alreadyconnected ceil phone.
4. Play/pauseln the standby state, you can click the leftand right multi-function keys of the
headset to play musicdirectlyClick the left and right headset multi-function keysto pause the
playback.
5. Switch songsWhen playing music, click themulti-function key of earphone three times to
switch upand down.
6, volume increase and decreaseDouble click the left andright multi-function buttons toincrease
and decrease thevolume.
7.Answerincoming callsWhen amobile phone call comesin, you can click the left and right
multi-function keys ofthe headset to answer the call.
8. Hang up the callDuring a phone conversation, you canhang up the phone by clicking the left
and rightmulti-function keys of the headset.
9. Call rejectionWhen a phone call comes in,long pressthe left and right multi-function buttons
of the earphonefor 2 seconds to reject the call.
10.Redial the last numberWhen standby or playing music.long press the multi-function button
ofearphone for 3seconds to dial your call recordThe last call made on thetape.