Pioneer SE-NC21M On-Ear Hadphone - Noise Canceller, on-ear, closed-back, foldable, up to 120 hours of noise cancelling with a AAA battery, 30 mm driver unit diameter, 44 ohms rated impedance, 95 dB efficiency, frequency response: 10 - 22000 Hz, 1,5 m cable with 3,5 mm/3P gold plated plug, weight: 120 g (without cable), incl. Case and flight adapter