Yamamoto USB Phone Cool silver [P/N 1025] PC-to-PC and PC-to-phone operation Driver built-in, no need for addtional driver USB1.1,2.0 compatible, no need for sound card. No external power required Complies with H.323, MGCP, SIP protocol Caller ID function of VoIP calls 199 incoming call and 199 dialed number With LCD and LED show Echo cancellation, noise reduction Full duplex communication For full Installation and Operation Instructions Go to www.yamamoto-group.co.uk