Product Features: 1). bluetooth 4.0 + EDR technology, lower power consumption, more stable signal transmission, superior bluetooth compatibility, works with most of the bluetooth enabled devices such as smartphone, tablet pc, smart tv, notebook ( may need extra bluetooth adapter ), etc. 2). 40mm high definition dynamic sound speaker drive units, amazing super bass and stereo sound, enjoy the wireless high quality music. 3). built-in concealed HD microphone, Noise Cancelling Proccessed, delivers natural and clear sound, handsfree support to answer incoming phone calls. 4). Based On Ergonomic Design, Ajustable Head Beam, The Earmuffs Is Made Of High Quality Soft Leather, More Comfortable And Suitable For Long Lasting Time Wearing. 5). The headphone body is made of ABS material, processed with Piano Varnish Baking.