Advanced noise cancellation technology effectively quells 90% stable low frequency background noise when in noisy environment airplane/subway/car/office/factory/crowd etc.( 90% sound canceling). Clear mega bass from unique designed sound chamber and Clear mega bass from unique designed sound chamber and 40mm premium speakers. Professionally stereo driver. Extremely comfortable memory protein leather with skin-friendly breathable feel. Exclusive Designs of Air Pressure Balance to reduce sound wave pressure of active noise reduction. Wearing much more comfortable than all other brands. Call Function: Enjoy online conference, online classes, calls hands-free with a built in mic on the headphone