The AKG K 812 is a high-end open-back reference headphone. It features large, 54mm drivers with a dual-layer diaphragm for precise and accurate sound reproduction. The headphones have a sleek design with an adjustable headband and soft leather ear pads for comfort. It has a wide frequency response range of 5Hz to 54kHz, providing detailed and extended audio performance. The AKG K 812 has a detachable cable and comes with a 3m cable with a 3.5mm jack. It is known for its detailed and balanced sound signature, making it popular among audiophiles and professionals.