[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/ off the receiver with transmitter from any place within a distance(Max range is up to 164ft/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 / 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store