USB sound card, connection for headphones and microphone, 2x3.5mm female, volume control, mute buttons. Width 2.3 cm Depth 4.4 cm Form factor External Interface 1 x headphones - mini-phone stereo 3.5 mm Interface 1 x microphone - mini-phone 3.5mm Interface 1 x USB - 4 pin USB Type A Height 1.1 cm Machine Varo Controllers and Indicators Volume control, mute button OS Required Apple MacOS, Linux, Microsoft Windows Vista / XP / 7 Device Type Sound card Interface Type USB.