describe Uses: Can be used for roller shutters, roller doors, projection screens, awnings, pumps, winches, conveyors, or other devices and equipment with AC motors, which can directly or reversely control the rotation of AC motors. Wireless control, easy installation. You can use the transmitter (remote control) to run the motor directly or in reverse from any location within a reasonable distance. RF signals can pass through walls, floors, doors, and windows. Range: ~20-50m (maximum sensor/signal range under optimal conditions or clear field/line-of-sight connection). RF signals can pass through walls, floors, doors, and windows. With reverse power supply and overcurrent protection. Reliable control: Receivers only work with transmitters that use the same code. One or more transmitters can simultaneously control one or more receivers. You can use two or more units in the same space.