Active Noise Cancelling Headphones Bluetooth,Barsone Hi-Fi Stereo Deep Bass Foldable Wired Wireless Headphones Over Ear with Microphone Carrying Case for Travel Work TV(20 Hour Playtime) WIRELESS AND WIRED CONNECTION: The noise cancelling function works well both in wire and wireless mode. Bluetooth V4.2 ensures a fast connection to all Bluetooth-enabled devices from as far as 33 feet away. Free to enjoy the superb high fidelity sound with thumping bass ACTIVE NOISE CANCELLING TECHNOLOGY: Active Noise cancellation headphones effectively reduce the noise of city traffic, airplane cabin noise or in a busy office while traveling, working & gaming(off-line game).Just enjoy your music, movies, and videos.HEADPHONES ON, NOISE OFF FOLDABLE HEADPHONES WITH CARRYING CASE: Retractable headband design,90swiveling ear cups, make it more compact when carrying it around. The lightweight BT headphones come with a carrying case, more convenient when traveling or using outdoors HEADPHONES WITH BUILT-IN MIC: The wireless over-ear headphone is a built-in microphone for hands-free calls, also allow you to move effortlessly between music and calls.20 hours playing time at 1/2 volume Bluetooth mode GUARANTEED: 30-day money-back guarantee for any reason,12-month warranty for quality-related issues.Gentle Reminder: pls take off the headphone every 2-3 hrs to get your ears relaxed, for better hearing enjoyment ANC works best at reducing consistent Low Frequency ambient noise, e.g. engine sounds, motor noise pls take off the headphone every 3-4 hrs to get your ears relax,for better hearing enjoyment Whether on a plane, train or noisy street,it provides a comfortable listening experience allowing you to relax and focus on the  music, not the noise. Advanced active noise reduction technology: Noise Cancellation Level: 25-30dB ANC is not as effective for sudden, irregular noises, car horns, shouting, screaming, etc. ANC may not work in very quiet environments, or some noise may be heard The ANC function will not work if the headphone battery has run out To maintain the sound quality of the S11+ in wired mode, please ensure the battery is not completely drained. Cannot simultaneously connect with multiple Bluetooth devices.