[Signal]Wireless signal can pass through walls, floors, doors or . You can use two or more units in the same place. You can turn on/ off the receiver with transmitter from any place within a reliable distance(Max range is up to 164ft/50m with no obstacle). [Widely Use]This remote switch used in industrial control and security fields, such as light, motor, remote controller, wireless security alarm, ,lifting equipment, electric doors, wireless door alarm,security industry machine , wireless controller, and other fields [Easy to Use ]We have made transmitter and receiver working together and test it before ship it,when you don't need to do anything ,just install it. [Learning code] the Learning code has high-level security for its low repetitive rate and re-learn mode, it can delete the old code and re-learn a new code,when a remote control get lost,So you could always control of it., Manufacturer: Koolenry