Feature: 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 perfectly as a water flows sensor, but also can be applied as a flows switch on heater. 4. Good Material: Combining premium 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 Note: 1. The installation should follow the flows direction on the back of the product, otherwise there will be no signal output. 2. A filter must be installed at the entrance of the sensor to prevent particles and debris from entering the sensor.