Welcome to our store! EASY TO INSTALL: The Hall flow sensor is lightweight, small, provides easy installation, easy to carry and use WATERPROOF AND WEAR-RESISTANT: The Hall component adopts a waterproof design to prevent water ingress, good quality material is inlaid inside the impeller, durable and wear-resistant THREE-WIRE CONNECTION: Red is positive, black is negative, yellow is pulse signal, different colors are clear for you to distinguish WATER FLOW SWITCH: The water flow sensor is applied to the water heater and can be used as a flow switch, useful and practical IMPACT STRENGTH POM: Made of good quality POM material, has good fatigue resistance and impact strength, good creep resistance Item Type: Hall Flow Sensor Material: POM Interface Size: G3/8 pipe Voltage Range: DC3.5-24V Inner Diameter: Approx. 5mm / 0.2in, Outer Diameter: Approx. 9.5mm / 0.37in Flow Range: 0.3-10L/min Pulse Frequency: F=(10xQ)±5% Withstand Voltage: ≤1.75map Output Pulse High Level: ≥DC4.6V (Input Voltage DC5V) Output Pulse Low Level: ≤DC0.5V (Input Voltage DC5V) Maximum Operating Current: 15mA (DC5V) Operating Temperature Range: ≤80℃ 1 x Hall Flow Sensor Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.