This 2 channel dc rf wireless latching remote control transmitter & receiver is widely applied to control on off electrical devices such like lights, motors, fans, electrically operated doors locks windows blinds, etc. It has the characteristics of reverse power protection and over current protection. It uses microcontroller model of EM78P156, an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology. There are three working voltages DC9V, DC12V and DC24V to choose from. Available transmitting frequencies include 315MHz and 433MHz.