INSMA 433Mhz Wireless RF Switch Long Range DC 12V 4CH Channel Wireless Remote Control Switch, DC12V Relay Receiver Module, Transmitter Toggle Switch 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 ControlAdjustable working way, control equipment turn/reverse, on/off. Switch Self-lock, Jog, Inter-lock. Security ControlLearning 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 code when a remote control get lost, so you are always in control of it. Easy to UseExtremely easy to setup, learn, relearn and control(please refer to introduction). Stable and reliable performance, high receive sensitivity. Wide ApplicationWIDE range of APPLICATIONS from simple domestic remote control to autonomous control such as, window, entrance, Garage Doors, alarm system, lifting equipment and so on. NOTE: Please email us if you meet any problem, we are always here to help, thanks! <span class="a-text-bold">Learn</span>: Press learning button, the indicator flashes, loosen finger, press any button of the remote transmitter, indicator flashes three times, meaning learning succeeds. <span class="a-text-bold">Remove</span>: press learning button for about 8 seconds , the indicator lights up and off, meaning remove succeeds.