Features: 1) USB 2.0 supported 2) With LCD and caller ID function 3) Supports SIP, H.323 and MGCP 4) Supports Skype, MSN, Xpro, Net2Phone X-Pro, X-lite, eyeBeam, Firefly, SJ phone and StanaPhone 5) Easy to be used as mobile phone 6) 16-bit USB sound card inside 7) No USB driver needed for Win 98 SE / Win Me / Win 2000 / Win XP / Mac OS 8) Echo cancellation, noise reduction, full duplex communication 9) Adjustable volume for handset and ring in call 10) PC-to-PC and PC-to-phone operation 11) 199 incoming calls and 199 dialed numbers 12) Phone rings for all incoming calls