AKG K-77 Perception Stereo Headphones closed back, circumaural, dynamic, 32ohm rated impedance, 200mW maximum input power, frequency range: 18Hz-20kHz, 115dB/V sensitivity, 2.5m cable with 3.5mm stereo mini-jack, includes mini-jack to 1/4" gold plated adapter. Weight: 190g (without cable).