Power: Cable length: 3.94 ft / 1.2 m
Capacity: 3640mAh
Battery Life: 40hrs when connected via Bluetooth at 50% speaker volume
Charging speed: 3.5hrs from 0%~100%
Additional Features: Conference calls via Bluetooth and USB connection Connects to your PC, tablet, or smartphone HD Voice for conversations in high definition sound quality Compatible with Windows Microsoft Lync and Microsoft Office Communicator Up to 15 hrs talk time / 4 days standby time