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Pc to pc and pc to phone operationDriver built-in plug and playUsb1. 1 compatible, no need sound cardNo external power requiredEcho cancellation, noise reductionFull duplex communicationComply with h. 232, mgcp, sip protocolKey-in tone functionCompatible with skype, the free pc internet phone service, with tens of millions of usersSupport MSN / YAHOO messenger, aim, net meeting, net2phone and any other internet telephone softwareFree phone calls among pc usersSkype out can facilitate calls to regular phone no. Compatible with firewall and nat with virtual IPBest voice quality with full duplex and echo free soundHardware generated dtmf signals for dialing to extension through pbxPlug and play installation operating without any external power adaptorThe LCD can display year, month, day and time