Specifications Active Noise=Cancelling-No Driver Type=Custom dynamic, 30mm with neodymium magnets Ear-Coupling (On-Ear/In-Ear)-On=ear/supra-aural, closed back. Headphone Frequency=20Hz-20kHz Headphone Sensitivity=83dBA at 1kHz Cable Length=3.93 Charging Time=2 hours Talk/Music Time=25 hours Connectivity Technology=5.3 Wireless Range=Up to 20 meters