♥85%ACTIVE NOISE REDUCTION TECHNOLOGY (Not 100%)♥Reduce distracting ambient noise by up to 85% with the flick of a switch.Wonderful noise reduction for travel, work and anywhere in between.makes you focus on what you want to hear,enjoy your music,movies and videos.Please note this ANC headphones are designed to reduce low frequency noises such as engine noise of airplanes or fridges and more.However,it will be not that effective to reduce middle/high frequency noises such as human voices. ♥NEVER POWER OFF,DUAL WIRELESS & WIRED♥The noise cancellation function can work well both in wired and wireless mode.Wireless mode:A built-in 210 mAh battery provides up to 8hrs playing time (bluetooth Mode)/30hrs playing time (noise canceling mode).Reliable and stable Bluetooth 4.1 connects in seconds from up to 33 feet away.The Wired mode:3.5mm AUX port with cable and flight adapter (included) for use in flight mode or with the provided audio cable so the headphones will never power off. ♥ENJOY COMFORTABLE DESIGN ♥The Memory-protein ear cushion simulate human skin texture,ensuring lasting comfort.The slider and softly padded headband allows you to find the perfect fit without constraint and provide excellent durability.

4OurEars is the only Grado Authorized Amazon Reseller The new "e" series headphones, hand made in Brooklyn, NY Manufacturers Warranty is only applicable in the US