DESCRIPTION: Dear customers, Thank you for selecting high-quality electronic product offered by Lenovo. This headset is manufactured with internationally advanced Bluetooth wireless audio transmission technology. This technology is characterized by stable signal, long transmission distance and Hi-fi stereo. Its in-built Lithium polymer battery of 380mAh provides a standby time of 12 hours, allowing you to enjoy the music and chat online freely. Mobile OS requirements: Android, WM6, WP7, IOS 4.1