S4PU-DC12+C-4 br This 4 channel high power rf wireless remote control transmitter & receiver operates in toggle, momentary, latched and toggle + momentary control mode. 4 channel enables it to control 4 same or different electrical devices. For example, switch on off the light, open close the door or start stop the motor. Three voltages 9v, 12v and 24v are provided. Transmitting distance is about 100m. Maximum working current for each channel is 30A.