... Support calling between PC-PC , PC-Phone,competitive price USB Skype Phone,Skype USB Phone for skype! Voip protocal ,etc.. Easy operation and widely used ... SPI Flash memory inside, dont need to install any softwares,auto-run uSipphone & X-PRO,Completely Play-and-Plug* Support ... the calling between PC-to-PC and PC-to-Phone* Echo cancellation,noise reduction,full duplex communication* Incoming/outgoing ...