1COMPACT SIZE: The water flow sensor is small in size and light in weight, easy to install and takes up less space, has a wide range of applications. 2GOOD WATERPROOF: Hall element waterproof design, excellent material inlaid inside the impeller, wear resistant and durable, greatly prolong the service life. 33P CONNECTION: The water flow sensor is 3 wire design, the red wire is positive pole, the black wire is negative pole, and the yellow wire is a pulse signal. 4USE ENVIRONMENT: The sensor flow range is 0.2-8L/min, with good pressure resistance, and the operating temperature does not exceed 80 degrees. 5MULTIPLE USAGES: With G1/4in PE pipe interface, standard in size, widely used in water heaters, water dispensers, etc., can be used as a flow switch. 1 x WaterFlowSensor Item Type: Water Flow SensorMaterial: POMInterface Size: G1/4in PE pipeVoltage Range: DC 3.5-24VInner Diameter: Approx. 6.5mm / 0.26inFlow Range: 0.2-8L/minPulse Frequency: F=(18xQ)5%Withstand Pressure: 1.75mapOutput Pulse High Level: DC 4.6V (input voltage DC5V)Output Pulse Low Level: DC 0.5V (input voltage DC5V)Maximum Operating Current: 15mA (DC5V)Operating Temperature Range: 80