Product Description:Speaker unit: MM diameterImpedance: Sensitivity: dBdBFrequency response: HZHzBluetooth specifications: Bluetooth V. Jerry JLFSupported protocols: ADP, AVRCP, HSP, HFPTransmission range: meters Transmission frequency: .GHzCharging voltage: DC VTalk time: about hours Music time: hours ( volume)Standby time: more than hoursBattery capacity: mAh; charging time: about hoursProduct net weight: gProduct size: mmSupports Chinese and English prompt sounds: doubleclick the M key when not paired