HM-11 Earclip Headphones Bone Conduction Earphones Sport Handfree Calling Noise Cancelling Open Ear

V5.4Chip No.RTL8753EFEAudio decodingSBC AACBT Call Earphone Protocol (HSP)HFP 1.7BT Hands Free Protocol (HFP)A2DP 1.3BT Music (A2DP)AVRCP 1.6BT Music Remote Control (AVRCP)HSP 1.2Transmission frequency2.4GHz ISMTransmission power-6~4dBmTransmission range (accessible open space)≥10mEarphone battery typePolymer lithium-ion batteryEarphone battery capacity50mAhNominal voltage3.7VCharging box battery typePolymer lithium-ion batteryCharging box battery capacity400mAhNominal charging voltage3.7VCharging current<400mA