CA-200 ONLY
The Call Alert CA-200 comes as a Master Unit and a Remote Unit (each sold separately). The Master Unit must be connected to a phone line. When the phone rings, the Master Unit will flash a connected lamp to let you know that your phone is ringing; at the same time it sends out a carrier signal (through the electrical wiring in your home) to the Remote Unit. The Remote Unit picks up the carrier signal and flashes its connected lamp. The Master Unit can operate and function with a Master Unit. Up to three Remote Units can be used with a Master Unit.
