[Easy to Use ]We have made transmitter and receiver working and test it it,when you it '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, windows,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 windows. You can use two or more units in the same place. You can turn on or off the receiver with transmitter from any place within a distance(Max range is up to 164ft or 50m with no obstacle).[Learning code] the Learning code has high-level security for low repetitive rate and re-learn mode, it can delete the code and re-learn a new code,when a remote control lost,So you could always control of it.Buttons: 2 ButtonsRemote Distance: 20-50MWorking frequency: 433mhzMax load current: 30AEncode: Fixed code or EV1527 codeColour:blackMaterial:plasticPackage Contents:1 x Remote Switch2 x 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 a little different from the real thing. The measurement allowed error is 1-3cm.