[Easy to Use ]We have made transmitter and receiver operating collectively and confirm it carry it,when you 't should do something ,just establish it. [Widely Use]This distant substitute used in industrial management and security fields, comparable to light, motor, remote controller, wireless safety alarm, windows,lifting equipment, electrical doors, wireless door alarm,security industry machine , wi-fi controller, and other fields [Signal]Wireless RF signal can struggle through walls, floors, doors or windows. You can use two or more goods within the similar place. You can turn on/ off the receiver with transmitter from anyplace inside a reliable distance(Max fluctuate is as much as 164ft/50m and not using a obstacle). [Learning code] the Learning code has high-level security for its low repetitive charge and re-learn mode, it'd delete the previous code and re-learn a fresh code,when a remote control get lost,So you need to always management of it. Buttons: 2 Buttons Remote Distance: 20-50M Working frequency: 433mhz Max load current: 30A Encode: Fixed code / EV1527 code Colour:black Material:plastic Package Contents: 1 * Remote Switch 2 * Remote Controls Only the above package content, other item will not be included. Note: Light and assorted reveals could cause the colour of the article in the photograph somewhat diversified from the real thing. The dimension allowed error is +/- 1-3cm.