Trust HEADSET SILVERLINE 751B. Headphone frequency: 20 - 20000 Hz. Dimensions (WxDxH): 184 x 95 x 220 mm. Cables included: Stereo audio cable (1x), 250 cm headphone cable length . Minimum system requirements: Recommended for computer use: DVD player, 5.1 soundcard, DVD playback software with 5.1 support , Compatibility: Multi