Product Description Support SKYPE platform and speed dialing, and only can support sound system W/o sound card for other platforms ,such as MSN,QQ,YAHOO... Support PC-to-PC and PC=to-phone operation Support SKYPE CRBT,vibrated ring and Volume adjustable Echo cancellation and noise reduction USB2.0 port, PnP,H.323,MGCP,SIP protocol full duplex communication key-in tone function Host system required： Pentium 400MHZ or above CPU 64MB or above memory 100MB or above hard disk free capacity one USB port available broadband or 56K Modem Windows 2000/XP operation system