X-318 Wireless Stereo BluetoothV2.1 Headphone<br /><br />Specification:<br />Type: Stereo<br />Version: Bluetooth V2.1EDR<br />Receiver range: 10m<br />Carrier frequency: 87.5MHz-108.0MHz<br />USB interface: high speed USB 2.0<br />Rechargeable lithium ba