Features: OOTDTY It can be utilized just by sticking on the outer wall of the container, and the set up very convenient. No mechanical moving parts, immoderate reliability. Small size, small area required for installation. Suitable for humidifiers, water heaters, consuming fountains, electrical home equipment and equipment that require liquid point control. Ultra-low standby calories consumption. brand new and fantastic Specifications: Material: Plastic+Metal Weight: 30g Size: As the picture displays Applications: Humidifiers, Water Heaters, Drinking Fountains, Working DC5V Working Current:<15MA Output Method: NPN Package Includes: 1x Liquid Level Note: 1 enable 1-2cm mistakes because of guide measurement, just be sure you don't intellect before you order. 2 to the variation between different monitors, the picture might not mirror the actual colour of the item.