Imported tube is used to ensures strong and stable current. It can be used for expanding channel, such as navigation lights, water pumps. The adoption of optical coupler isolation technology, strong antiinterference ability, ensures that CDI high voltages will not cause interferences to the receiver signals. It can be used to expand the channel, for example, the remote control of night light, landing gear, water pumps and other equipment. Small and light, the size of a coin