HBS-900 Tone Infinim Wireless Stereo Headset combine Harman Kardon's signature sound with Bluetooth 3.0 streaming from your compatible mobile devices, including support for the A2DP, AVRCP, HFP, and HSP Bluetooth profiles. Each side of the headset features a retractable ear bud which helps prevent tangles and maintain the sleek overall form factor of the device. Dedicated buttons for play/pause and answer/hang up calls enable easy control over your media and contacts. The unit's "Jog" button interface system provides one-touch volume and music control. The built-in rechargeable battery provides up to 17 hours of talk time, up to 14 hours of music playback time, and up to 23 days of standby time.