Sennheiser HD 429s. Interface type: 3.5 mm, Cable length: 1.2 m. Ear coupling: supraaural, Headphone frequency: 18 - 22000 Hz, Headphone sensitivity: 110 dB. Microphone frequency: 100 - 10000 Hz, Microphone sensitivity: -39 dB. Weight: 0.219 kg. Packaging height: 230 mm, Packaging width: 184 mm, Packaging depth: 95 mm