... USB Voip phone, driver wirless usb phone,ideal for a present,good for business man on trip,support PC-PC,PC-Phone,etc Cheap pric ... can read/write phonebook free and auto run on PC without install any driver!Support most of voip protocal ,etc.. Easy operation ... matix LCD display,easy operation* Support the calling between PC-to-PC and PC-to-Phone* Echo cancellation,noise reduction,full duplex ...