Vida IT (Black) Bluetooth Headset For HTC - Inspire 4G - Freestyle - ThunderBolt 4G - EVO Shift 4G Cell phone - Noise Cancellation - Connect 2 Phones - Volume Control Bluetooth V3.0 +EDR Class 2 compliant Up to 5 Hours of Talk Time 70mAh Li-Polymer Battery - Standby time 115 Hours - Charging time 1.5 Hours Standby Time: Up to 115 hours - 3 Button Design - Volume Control Connect 2 phones at the same time - Range 10M - Weight 9 Grams