Carson HP30 dynamic stereo headphones feature a "super-bass" response, in-line volume adjustment, soft cushion ear cups, an adjustable slider headband, and 40mm diameter speakers. Impedance is 32 ohms and frequency response range is 20-20kHz. Includes a 12ft/4m cable with a 3.5mm stereo jack, plus an adaptor for a 6.3mm jack.