Beyerdynamic DT 131 Trendline Headphones Open, dynamic headphone designed for any type of portable audio device Adjustable headband and soft cotton jersey ear pads for all-day comfort Natural, transparent hi-fi sound with 20 Hz to 18 kHz frequency response 40-ohm impedance Single-sided 8-foot cable with 1/8-inch stereo mini jack and 1/4-inch adapter