Bluetooth wireless technology with in-line mic and controls for answering/ending calls, controlling music & video playback and controlling volume on Bluetooth wireless devices High-performance 9.8 mm drivers for rich, wide-range sound reproduction The compact housings are designed to provide a comfortable fit for ears of all sizes Machined brass stabilizers absorb unwanted vibration for clearer Mid and high frequencies Internal Lithium polymer battery provides seven hours of continuous use (200 hours on standby) on a full charge