The ATH-WS990BT wireless over-ear headphones combine exclusive 53 mm Deep Motion Drivers with large high-flux magnetic circuitry and Bluetooth technology to deliver vibrant full-range wireless audio with invigorating bass The powerful magnetic force of the circuitry results in dynamic well-tailored diaphragm response to reproduce deep clear low frequencies and detailed mid-to-high frequencies The sound is further enhanced by the exclusive dual-layer memory-foam ear pads comprised of a firm internal layer and a soft outer layer that provide excellent sound isolation and comfort The headphones can even reproduce Hi-Res Audio when used with the included 1 2 m (3 9') audio cable In addition to providing high-fidelity wireless audio the ATH-WS990BT headphones also feature noise-cancelling and hear-through functionality that gives you greater control over your interaction with the outside world and its noise The headphones' selectable active noise-cancellation function dampens the ambient noise for greater enjoyment of the Solid Bass audio in loud environments Conversely the selectable hear-through function allows voices in the surrounding area to be heard through the headphones This lets you listen for important announcements say in a train station or airport and hear the voice of anyone who might engage you in conversation A mic and controls are built into the left ear cup giving you convenient control of calls and music playback on a wirelessly connected device An audio cable is also included to let you use the headphones in areas where wireless operation is prohibited (e g in airplanes or hospitals) when battery power is low or when you want to listen to Hi-Res Audio The headphones' internal lithium polymer battery provides up to 30 hours of continuous wireless use (up to 1 000 hours in standby mode) and can be recharged using the included 30 cm (1 0') USB charging cable