Monoprice SonicSolace Active Noise Cancelling Bluetooth Wireless Headphones - Black Over Ear Headphones

* Up to 16 hours audio playback without active noise cancelling enabled. Up to 8 hours of audio playback with active noise cancelling enabled * Built-in 320mAh lithium-ion battery * 40mm drivers with neodymium magnets. 105dB sensitivity. * 20 Hz ~ 20 kHz frequency response. 105dB sensitivity. * Bluetooth version 4. 0 with A2DP AVRCP HFP and HSP profiles