Hercules HDP DJ-M40.1 DJ Headphones Versatile DJ headphones for DJing and leisure use 60 ohm drivers: low enough impedance for strong output volume on DJ gear, computers and mobile audio players Efficient sound isolation: Large ear pads shield the user's ears from ambient noise; Closed-back ear-cups prevent sound from bleeding out 50 mm diameter drivers: clear playback for strong bass response; 20Hz-20kHz: bandwidth covers all audible frequencies; 95 dB at 1 mW sensitivity: strong output level lets you preview tracks in any environment Swivel housing for convenient use; Easy 1-ear monitoring; Easy folding and mobility; Extending arms for both large and small heads