The W860NB are a set of a noise cancelling headphones which decreases outside noise giving you a chance to make the most of your music. Noise cancelling headphones utilize an amplifier to listen to surrounding commotion emitts a recurrence that removes outside commotion. Active Noise Cancelling (ANC) limits outside interference and maximizes performance. Bluetooth V4.1 technology ensures a lossless wireless experience. Supports NFC pairing and Qualcomm aptX audio decoding. Up to 25 hours of playback. Smart touch controls call, music, and volume by a simple touch to the side of the ear cup. Wireless and wired modes for connection versatility. Leatherette ear cups for soft, comfortable listening. Specifications Impedance : 32? Sound Pressure Level (SPL) : 97dB Connector : 3.5mm stereo Cable Length : 1.3m Working time with ANC : 25 hours Standby time : about 800 hours Charging Time : about 4 hours What's in the box W860NB Headphones, Storage bag, USB charging cable, 3,5mm audio cable, Aircraft plug, User manual