Features 1、100% brand new and high quality. 2、The water flow sensor is made of high quality material, long service life. 3、It can install at the water inlet of the water machine to detect the influent flow 4、Small body and stable performance 5、Suitable for water cooler, coffee machine, water filter Specification Features: 1. 100% brand new and high quality 2. The water flow sensor is made of high quality material, long service life. 3. It can install at the water inlet of the water machine to detect the influent flow 4. Small body and stable performance 5. Suitable for water cooler, coffee machine, water filter Specification: Condition: 100% Brand New Model: YF-S401 Monitoring Range: 0.3-6L Accuracy: 3% Wiring Method: Red +, Black -, Yellow For Signal Output (NPN Pulse Signal) Water Pressure Resistance: 0.35MPa Insulation Resistance: >100MΩ Accuracy: (in 0.15-3L / Min) ±2% Flow Pulse Characteristics: f = (73 * Q)±2% Q = L / Min Output Pulse Duty Cycle: 50% ±10% Package List: 1 * Water Flow Sensor Package List