This DC RF Motor Remote Controller (S1FD-DC12 & CA-4) features forward-reverse-stop capability. You can rotate the motor in positive or reversal direction by transmitter from any place within a reliable distance, wireless signal pass through walls, floors and doors. With time delay function, the working time of positive reversal rotation can be adjusted from 10 to 60 seconds. It is suitable for the motors of rolling blinds doors, projection screens, awnings, pumps, winches, conveyors or other electrical devices.