Specification:Color: Blackbluetooth Standard: bluetooth 4.2Profile: Support A2DP 1.3,AVPCR 1.6,HFP 1.6,HSP 1.2Audio Decoding: Support AAC,SBC...Weight: Around 100gMaterial: PlasticInterface: 3.5mm AUX InterfaceInput:5VPower Supply: 3.7VWorking Time: 10HoursCharging Time: 2HoursSNR: 85dBLiBatteryCapacity: 300mAhSize: 58.5X 58.5X 13.2mmFunction Operation:Receiver mode: This product is powered on receiver mode by default. Long press the key to turn on, and open mobile phone bluetooth tosearchBT-B7for this device pairing.Package Included:1X bluetooth Adapter(built in rechargeable battery )1X 3.5mm AUX Cable1X USB Cable1X User Manual