Closed-Back, Over-Ear Design Oval earpads and a closed-back, over-ear design provide superior isolation and improved bass response Largest-In-Class Drivers 50 mm drivers provide superior performance and extended bass response Wired or Wireless Listening Listen via Bluetooth with 24-hour battery life, or connect using one of the included cables Foldable, Notched Hinge 3-position articulated hinge, collapsible for maximum portability Slow-Retention Foam Earpads Superior comfort and fit for longer listening sessions with less bass leakage Sleek Style Pro performance with lifestyle fit and finish Precision Performance, Pure Freedom Whether you're an artist, engineer, podcaster or beat maker, you're always in creative mode. AKG K361-BT Professional Studio Headphones strike the perfect balance between studio-quality sound, Bluetooth functionality, plush comfort and a sleek, sturdy design that stands up to your mobile lifestyle. K361-BTs are precision-engineered to reproduce natural, balanced audio in exceptional detail, so you can make more confident decisions when you're mixing and editing. They deliver the deepest bass and highest highs in their class, with a stunning frequency response of 15 Hz to 28 kHz. K361-BTs offer the convenience of switchable Bluetooth wireless and wired connectivity; a built-in microphone allows two-way Bluetooth communications. Plush, ergonomic earcups cradle your ears in supreme comfort-because once you hear how amazing your K361-BTs sound, you won't ever want to take them off.