. Headphone Driver Dynamic, 50mm with Neodymium magnets Form factor Closed Back Frequency response 10 Hz - 20.2 kHz Impedance 32 Ω Sensitivity 104.5 dBSPL/mW at 1 kHz T.H.D. ≤ 2% Frame type Plastic Ear cushions Memory foam and premium leatherette Microphone Element Electret condenser microphone Polar pattern Bi-directional, Noise-cancelling Frequency response 20 Hz - 6.68 kHz Sensitivity -12 dBFS/Pa at 1kHz Connections and Features Audio connection Wireless USB USB audio format Stereo USB specification USB 2.0 Sampling rates 48 kHz Bit-Depth 16 bit Included virtual surround sound DTS Headphone:X Audio controls Onboard audio controls Battery Type Rechargeable lithium-polymer Battery life 20 Hours* Charge time 3.5 hours Wireless Type 2.4GHz Wireless range Up to 20 meters** Physical Weight 275g Cable length(s) and type(s) 0.5m USB charge cable