Califone Switchable Stereo/Mono Headphones can be used with PC, Mac, cassette and CD players and either stereo or mono applications. A 3.5mm plug and 1/4 inch adapter are included. Features 40 mm mylar dome driver unit transducers, 36 ohms impedance, and 98dB +/- 3 Db at 1 kHz sensitivity..

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Dual volume controls on each earcup for optimal listening
Noise reducing, ABS plastic for durability
Headband and earcups are cushioned for added comfort
Switch between monaural and stereo modes for optimal sound quality