[Easy to Use] The transmitter and receiver are pre-paired and tested before shipping, so no additional setup is required—simply install and use. [Widely Used] This remote switch is suitable for industrial control and security applications, such as lights, motors, remote controllers, wireless security alarms, lifting equipment, electric doors, wireless door alarms, security machinery, and other wireless control systems. [Signal] The wireless RF signal can penetrate walls, floors, and doors. Multiple units can be used in the same location. You can turn the receiver on or off from any location within a reliable range of up to 164ft (50m) in open area. [Learning Code] The learning code feature offers high security with a low repetition rate and re-learn capability. It allows deletion of old codes and programming of new ones, ensuring control even if a remote is lost. Buttons: 2 Remote Distance: 20-50m Working Frequency: 433MHz Max Load Current: 30A Encoding: Fixed code / EV1527 Note: Product appearance and printed text may vary slightly between batches, but this does not affect functionality. Color: Black Material: ABS Package Contents: 1 x Remote Switch 4 x Remote Controls Only the above items are included; other accessories are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3cm.