Offering "exceptional clarity and maximum comfort for hours of listening" the M20 headphones have a low-profile design providing "superior isolation in high-volume listening situations" a lightweight, adjustable cushioned headband and an "ultra-flexible" coiled cable with single-side exit. Closed back, dynamic headphone. Response: 30Hz-20kHz. Impedance: 40 ohms. Sensitivity: 98dB/mW. Maximum input level: 1200mW, 1kHz. Weight: 230g. without cable. Cable: 3metre, coiled, single-sided. Connector: 3.5mm stereo jack. Includes: snap-on 6.35mm adapter.