Stagg SHP-2200H Stereo Studio Headphones Driver unit: 40 mm (1.625 in.) diameter - Impedance: 32 Ohms @1Khz Sensitivity (SPL): 102 dB/mW @ max.power - Power handling capacity: 500 mW max. Frequency response: 20 Hz - 20 kHz @ -3dB Cord length: 1.2 m (4 ft) long - Plug: 1/8" Stereo mini-plug (3.5 mm / 0.1 in.) Accessory: 1/4 in. (6.3 mm) Stereo jack plug adapter