The DJ Pro 300 is a lightweight, comfortable single-sided headphone. It features high efficiency 40 mm heavy-duty drivers. Comes complete with detachable cord (3 m) with 1/4" plug. Features: Frequency response 20-20 kHz Sensitivity 100 dB @ 1 mW Free carrying pouch included Specs Type: Closed Frequency: 20 Hz - 20 kHz Sensitivity: 100 dB @ 0.2 mW. 1 kHz per channel Impedance: 100 ohm THD: Less than 1/4% @ 1 mW @ 1 kHz Power: 500 mW max. Net Weight: 200 g.