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, drinking fountains, electrical appliances and gear that require liquid point control. Ultra-low standby energy consumption. fresh and high quality Specifications: Material: Plastic+Metal Weight: 30g Size: As the image displays Applications: Humidifiers, Water Heaters, Drinking Fountains, Working DC5V Working Current:<15MA Output Method: NPN Package Includes: 1x Liquid Level Note: 1 allow 1-2cm errors due to handbook measurement, simply be sure you don't intellect earlier than you order. 2 to the variation between different monitors, the image won't mirror the actual colour of the item.