USB phone Model No K-260W Main functions features 1, Supporting SIP, H.323, MGCP, IAX2, net2phone etc lot of protocol 2, Supporting Skype, MSN, QQ etc many software 3, USB 2.0 port 4, 16 bit sound card inside, the PC can without Sound Card 5, Support product serial write in 6, With HID (Human Interface Device) Feature 7, Plug & Play to Install USB Driver 8, No driver needed for Win98 SE/Win ME/ Win 2000/Win XP 9, With PID (Physical Interface Device) Feature 10, Implement "Real-Time" verification 11, Compatible with Major PCs Internet Phone Application Software 12, Provides Ringer Generation for PC to PC Call Through Existing IP phone Applications 13, Optional ITSP Application Software With Credit for PC to Phone Connection 14, ALED to indicate Power and Linking Status 15, Adjustable volume for handset 16, Support E.164 dialing rule 17, Record support 18, LED indication 19, The powered via the USB port with not need for a power adapter FCC and CE approval!