Bluetooth wireless convenience - built-in mic & multi-function button to answer calls, adjust volume, and activate your smartphones voice assist; 20 hours playback on full charge + 15min quick chargeNoise-cancelling headphones - reduce unwanted ambient sounds in your headphones using Active noise control with 3 different level settings to suit your preferencePremium audio - Hi-Def sound via Bluetooth & Hi-Res Audio at home with a wired headphone connection; powerful 40mm HD driver units, MLF diaphragms and anti-vibration frames provide hours of dynamic soundAmbient sound Enhancer - lets you clearly converse without taking off your headphones; simply cover the right headphone speaker Housing with your hand to activateUltimate fit & comfort - 3D ball joint structure enables headphones headband and soft, plush 3D ear pads to move freely in three dimensions at once for the ultimate fit around the head and ears