AKG K77 CUFFIE PROFESSIONALI The K77 Perception over-ear, semi-closed headphones provide powerful sound at an amazing value, perfect for home and project studios. These closed-back headphones are an all-around performer, offering an accurate listening experience. K77 Perception headphones include comfortable leatherette ear pads and a self-adjusting headband, allowing extended wear without discomfort. They come with a 2.5m (8ft), fixed, straight cable, including convertible jack plug.