The Virtual 8.1 Channel USB DAC is a highly flexible USB audio interface which can be used either with desktop or notebook systems as external sound card. No drivers required. Features & Specification: Complaint with USB 2.0 full-speed (12Mbps) specification Compliant with USB audio device class specification 1.1 Compliant with USB HID class specification 1.1 USB bus-powered mode no external power required Connectors: USB Type-A stereo output jack mono microphone-input jack Functional Keys: Microphone-Mute Speaker-Mute Volume-Up Volume-Down Previous-Track Next-Track Play/Pause Include Xear 3D for Windows XP/Vista