Features： 1、Flows Counter Sensor: Designed to have wide flows measuring of 0.2‑8L/MIN, the flowmeter also has high measurement accuracy. 2、Reliable Work: Waterproof design together with Hall component ensures stable working performance with high efficiency. 3、Practical Use: Not only works ly as a water flows sensor, but also can be applied as a flows switch on heater. 4、Good Material: Combining POM material with stainless steel shaft in the impeller, very durable with wearing. 5、Easy to Install: Red line connects to positive pole, black line connects to negative pole, and yellow line connects to pulse signal. Specification： Item Type: Water Flow Meter Sensor Material: POM Interface Size: 1/4in Voltage Range: DC 3.5-24V Flows Range: 0.2-8L/min Pulse Frequency: F=(20 x Q)±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℃ Package List： 1 x Water Flow Meter Sensor