Active Noise Cancellation Technology(ANC). Professional advanced noise cancellation technology,effectively cancel 85% machine noise such as airplane/bus/factory/office noise, etc.(pls kindly note:it's not 100% noise cancellation,but it will quell much background noise.)so you can focus on what are you doing. - ANC function works well in both wired and wireless mode. - NC25 noise cancelling headphones would be the best model in the same level of price. | Sound Quality. - High-end 40mm stereo drivers provide immersive Hi-Fi Deep Bass. - Noise-rejecting built-in dual-microphones system for Hands-Free call,clear sound and voice pick-up. - Advanced bluetooth CSR to make and receive calls with quick and stable Bluetooth connections. | Unique Foldable Lightweight Design. - The professional protein ear-pads and 115° swiveling ear-cups with superb LIGHTWEIGHT only 0.4 lb and the durable foldable design for carrying and traveling. | Long Hours Playtime.16hrs music time talking time per charging and 3.5mm stereo audio cable provided. - Audio cable can be used when low battery. | Ultimate Fit & Comfort - Exclusive Designs of Air Pressure Balance. - Multi-level adjustable headband to get the best suitable size for you. - To reduce sound wave pressure of active noise reduction,to feel much more comfortable to wear than all other brands.