Noise Cancelling TechnologyProfessional advanced noise cancellation silences up to 90% of machine noise. Cancels noise from aircraft, subways, cars and crowds,so you can focus on what are you doing. (Kindly Note:its NOT 100% noise cancelllation,Human talking CAN NOT be elimated)Provides High-Res Audio in SilenceFeatures a dual 40 mm HD high-resolution audio driver, a high-response diaphragm, lightweight voice coil. Delivers peerless sound with no interruptions.Sometimes quality just needs to be heard.Find the rhythm of your soul10 Hours Music EnjoymentA built-in 200mAh battery won't allow your headphones power off, you can enjoy your world without noise for 10 hours' long time with a single charge.or plug in 3.5mm stereo audio cable to prolong using time when battery is low.Unique Foldable Lightweight & Ergonomic DesignSoft and comfortable when you use it. And it is light weight, even during long periods of use. Folds away compactly for easy storage when travelling. Ergomonic headsets' structure and multi-level adjustable headband to get the best suitable size for you.