Cardo Systems Scala 700 Bluetooth Headset [Retail Packaged] Location Buzzer: press a button on their mobile phones to activate the locator six-level volume range, speaker booster and echo-cancellation technology further enhance the headset's superb audio quality Talk time: up to 10 hours - Standby time: 240 hours Battery Status LEDs: blue  fully charged; blue and red  half charged; red  immediate need for recharge Compatible with Bluetooth Capable Phones