Listen wirelessly in total comfort with the lightweight MDR-ZX770BT headphones. Built-in Bluetooth and NFC One-touch connectivity means you can instantly link to your smartphone without a wire in sight. Youll also feel every pounding beat, thanks to powerful 1.57 in drivers and Beat Response Control. Link up wirelessly with your music player, smartphone, tablet or dock. With Bluetooth, you can listen to all your latest tracks without having to worry about cables. Up to 17 hours; battery life, listen to your music from dawn to dusk with Bluetooth on. With an adjustable headband and soft comfortable ear pads, youll find these headphones a joy to listen to wherever you go. Synthetic ear pieces. 1.2m cord length. 3.5mm jack cord. In-line and separate volume control. Adjustable headband. 0.95% noise cancellation. 3.5mm jack . 40mm driver. Batteries required 1 x rechargeable battery (included) .