Product Specifications: Bluetooth Specification Version 2.0 Class 2 Support the Bluetooth headset. Hands-free device. A2DP and AVRCP Mode 250mAh Lithium Polymer Rechargeable Battery With i.Tech 110 ~ 240Vac charger is compatible with Talk time: Up to 6 hours Music playback time: Up to 6 hours Standby time: Up to 150 hours Charging time: about 3 hours Size (main body): 55 x 24 x 27 Hao Mi Weight: 20.1 grams