BlueZen BH-403. Interface type: USB, Bluetooth version: 2.0+EDR. Ear coupling: intraaural, Acoustic system: closed, Headphone connectivity: USB. Battery technology: Lithium Polymer (LiPo), Talk time: 5 h, Standby time: 120 h. Dimensions (WxDxH): 40 x 18.8 x 11.5 mm, Weight: 8.2 g. Cables included: USB