[Easy to Use ]We have made mitter and receiver working together and test it before ship it,when you don't need to do anything ,just install it.[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[Signal]Wireless RF 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 mitter from any place within a reliable distance(Max range is up to 164ft50m with no obstacle).[Learning code] the Learning code has highlevel security for its low repetitive rate and relearn mode, it can delete the old code and relearn a new code,when a remote control get lost,So you could always control of it.Buttons: 2 ButtonsRemote Distance: 2050MWorking frequency: 433mhzMax load current: 30AEncode: Fixed code EV1527 codeColour:blackMaterial:plasticPackage Contents:1 * Remote Switch2 * Remote ControlsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is + 13cm.