Cardo Systems SCALA700LX Bluetooth Headset Includes a location buzzer allowing users to page the headset from mobile phone if headset is misplaced Six-level volume range, speaker booster and echo-cancellation technology further enhance the headset's superb audio quality Up to 10 hours talk time; 240 hours standby time when fully charged Battery Status LEDs: blue  fully charged; blue and red  half charged; red  immediate need for recharge Bluetooth version 2.0