The Afloat switch detects the level of a liquid in a tank or container . It floats on top of the liquid surface and acts as a mechanical switch as the liquid level goes up or down. They control devices like pumps (pump water in or out), valves (open or close inlet/outlets), or alarms to notify users. Specifications: Whether the smart : Yes Place of Origin: China Brand Name: Model Number : FAST-25~300LP-2A1 Max. Current : 0.5A Max. Voltage: 220V Material: Plastic PP Installation : Vertically Mounted M8/M10/M12/M16,1/2",3/4" Rod Length : 25~300mm Switching Type : NO/NC Switching Power : 70W Switching Voltage V : 200Vdc/250Vac Switching Current A : 0.5A Breakdown Voltage : 480V Temperature : -20~+90C Application : Water Tank Package Includes: 1 x Gold Star Float Switch Water Level Switch