433Mhz Wireless RF Switch, DC 12V 4CH Channel Long Range Remote Control Relay Receiver Module, Transmitter Toggle RF Relay (2 Transmitter & 1 Receiver)Long Range: Signal can pass through walls, floors and doors, steadily control receiver from any place within a reliable distance. Max range is up to 98ft 30m with no obstacle. 4CH for More Control: Adjustable working way, control equipment turn reverse, on off. Switch Self lock, Jog, Inter lock. Security Control: Learning code has high level security for its low repetitive rate and re learn mode, by which it can delete the old code and re learn a new