AKG K52 Closed-back headphones

Professional 40mm Drivers For reference monitor accuracy over a precisely balanced 18Hz–20kHz frequency response Lightweight Design and Self-Adjusting Headband For exceptional comfort over long periods of time Professional Build Quality Metal construction and closed back design for excellent durability and sound isolation Flexibility Low impedence design and included adapter Design: Closed-back over-ear headphones Frequency range: 18 Hz to 20 kHz Sensitivity: 110 dB spl/V Max. input power: 200 mW Input impedance: 32 ohms Net weight: 200 g (7 oz) Cable: 2.5 m (8.2ft) cable Main connection: 3.5 mm (1/8 #34;) plug with 6.3 mm (1/4 #34;) adapter