This Liquid Water Level Sensor can be used to detect the liquid levle in tank/container. Non-contact, works without direct contact with the liquid inside the tank. in size, easy to install. Size:30*19*10mm/1.18"*0.75"*0.39" Working voltage:DC5V or 12-24V Maximum output:30mA Responce time:0.5 Sec Working environment:0Degrees Celsius to 60Degrees Celsius. Sense distance:10mm Application:Household appliances , sanitary wares intelligent control , drinking & cleaning water and water treatment equipments, treatment and foodstuff mechanism equipments, chemical mechanism equipments and so on. Connection and :Black:GND White:Output Red:VCC material:plastic colour:black Package included:1 x Non-contact Tank Liquid Water Level Sensor Switch 1 x Bracket(just for flat surface) Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.