Telephone features: Supporting skype and sip, h.323, mgcp With keypad and ringer, easy to use Driver and sound card built-in, no driver and sound card required Echo cancellation, noise reduction, full duplex communication Pc-to-pc and pc-to-phone operation Make/receive VOIP calls Pc-to-pc, pc-to-phone operation Complies with h.323, mgcp, sip protocol Skype ready, share your standard phone with skype Cheap calls One USB interface to PC, USB a-type connector Pc-to-pc and pc-to-phone operation(application and server system needed) Driver built-in, no need additional driver Usb1.1 compatible, no need sound card. No external power required Echo cancellation, noise reduction Full duplex communication Application support: Netmeeting/messenger, mediaring, net2phone, dialpad System requirement: P2 with 200 MHz CPU or better with USB interface 64mb of RAM 10mb or more hard disk space Operating system: Windows 98/me/2000/XP Network: LAN, ADSL, isdn,33.6k modem or better Colors: White black, metalic blue, dark blue, silver white etc. Units per carton:20 Weight:16.60kg/CTN Measurement: L47.60cm*w39.00cm*h48.00 cm Main export markets: Europe, America, Asia, middle east, Australia, south Africa