Skype/PSTN DECT 2.4G cordless Dual Phone The effective distance that can be received is 80-100m in room(300-400m out room) The product can communicate with other one USB Phone or company Gateway free of charge through Internet. Or make IDD call or city by prepayment mode, it is one ideal PNP VOIP Phone, which is suitable for the businessman and individuals 75 channels Auto Hoping IBM Compatible PC (notepad). Pentium 300MHz or over32MB memory , 20MB hard disk space Support Skype IP call , Make and receive IP call by using USB button High voice quality same as Skype call Full duplex communication, Echo cancellation and noise suppression technology ,16-bit high voice quality Application support: Skype, MSN Messenger, SJ phone etc.(Support Skype, Mediaring, Net2phone, Etalk). Cooperating with network and PSTN system, economic IDD call service will be provided