AU-100 VoIP USB Phone -Works w/Skype, Vonage & More AU-100 VoIP USB Phone General Specifications: USB 2.0 support 16 bit sound card inside HID support Adjustable volume for handset In call ring PC-to-PC and PC-to-phone operation Driver built-in, no need additional driver No external power required Echo cancellation, noise reduction Full duplex communication Regulatory Approvals: FCC CE