PhoneLink is a two unit system that extends a standard dial-up phone line to locations where wire can't go. The Master unit installs at the phone line. The Remote unit installs with your device providing standard dial tone and ring voltage making your device think its connected by wire all the way. Calls are supported both directions with data rates from 300 to 2400. Both units have all components built-in including power supplies. Short range antennas can be built-in too. Just connect power and phone lines, and its ready for service.