Listen via Bluetooth with up to 40-hour battery life, or connect using one of the included cablesAKG K371 Professional Studio Headphones strike the perfect balance between studio-quality sound, plush comfort, and a sleek, sturdy design that stands up to your mobile lifestyle. K371s are precision-engineered to match AKG’s Reference Response acoustic target to reproduce natural, balanced audio in extraordinary detail. They deliver deeper bass and higher highs than any other model in their class, with a stunning frequency response of 5 Hz to 40 kHz.