Active Noise Cancelling Bluetooth Headphones adopt Active Noise Cancelling Technology to create a quiet listening space for you on the journey, make you freely enjoy the music, watch the movie on the plane/bus/railway, giving you a pleasant journey. Advanced active noise cancelling technology effectively reduces low-frequency noises. 40mm large-aperture drivers give you crisp, powerful sound with deep bass. Comfortable around-ear ear cushions for all-day wear. Up to 20 hours music/talking with a single charge. Built-in CVC 6.0 microphone for hands-free call. Thanks to the Wireless technology, you can stream your music from smartphones, tablets, TVs and other Bluetooth enabled music devices within 33ft. Note: you need a SEPARATE transmitter when connected with TV.