These Modular Radio Receivers are one half of a two part remote control system. They operate as ordinary ON/OFF switches but they also respond to the signals of a hand held transmitter-the other half of the system. The modules are designed for indoor or outdoor use, and can handle a variety of switching applications. By the push of a button on the face of the transmitter, the user is able to turn ON/OFF the connected load (lights, pump, etc.) from any remote location, inside or outside of the house, safely and conveniently. In addition, a single transmitter can operate up to three receivers and is able to "teach" each module a different code (Transmitter model RC939 sold separately). Heavy duty receiver module. 20-Amps Resistive, 120, 240 V, 12.5-Amps..WIRELESS RADIO RECEIVER ASSEMBLY; RC600 MODEL; APPROVAL CSA (CANADA AND US); SIZE 4 INCH W X 3-1/2 INCH D X 7-3/4 INCH H; CURRENT RATING 20 AMPERE (RESISTIVE), 12. 5 AMPERE (TUNGSTEN) AT 120 VAC; POWER RATING 1. 5 HP, 3 HP, 1500 W; DISTANCE 100 FT