Features: Simple structure,easy installation liquid level controller. It does not have complex circuit,will not be-disturbed,as long as the material selection,liquid,pressure or temperature can be used in any environment. Light weight and simple working principle,high reliability. Multi-layer waterproof protections ensure safe use and long service-time. Widely used in electronic,electrical,water treatments,drainage and other walks-of life level control and alarm. Specifications: Material:Metal Interface:G1/4 Voltage:0.5-2.5V,0.5-3.5V,1.125-3.325V,0-4V(optional) Note: The general model supports IIC protocol, and does not support other existing protocols. Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Water Level Sensor