specification:    Bluetooth Version：V2.1 EDR   Frequency coverage: 2.402~2.480 GHz ISM Band   Sensiticity: -80dbm Wireless transmitter standard: Class 2   Channel: 79 channels of 1MHz BW  Contact terms: Point-to Point   Transmit range: Up to 10m   Transmit speed: 57~723Kbps Stereo compression

specification:    Bluetooth Version：V2.1 EDR   Frequency coverage: 2.402~2.480 GHz ISM Band   Sensiticity: -80dbm Wireless transmitter standard: Class 2   Channel: 79 channels of 1MHz BW  Contact terms: Point-to Point   Transmit range: Up to 10m   Transmit speed: 57~723Kbps Stereo compression ratio： 44.1/48 KHZ  Support format: MP3 WAM    Talk time:Up to 4H Charge time:1-2H   Size (L x W x T): 15.5*13*5cm   Power source: Built-in Li-on Battery(USB Charging) Package includes:    1 Pcs Sport Bluetooth Wireless     1 Pcs USB cable