The radio frequency remote control adopts radio frequency technology, the working frequency is 433MHz, and the signal is stable. High-power load: The relay adopts 40A relay, which can load high-power electrical appliances to long-term stable control. Working mode: momentary, switching, locking mode. Strong Signal: Using technology, it can penetrate walls, floors and doors to control receivers anywhere within a reliable distance. The maximum range is up to 984 feet with no obstacles. WIDE APPLICATION:This remote relay switch used in lamps,electric doors,water pumps, motors, ,gate,industrial control and security industry and other fields. Colour:white + black Material:Plastic + Metal Size:54 x 48 x 28mm Package Contents: 2 x Remote Control Switch 4 x Remote Control Only the above package content, other products are not included. Note: Light reflection 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 +/- 1-3cm.