DIY Supplies:Plumbing Model Number:FS400A Note:The color of the item may vary slightly due to photography and your own computer Impeller inlaid stainless steel beads,always wearable. Flow range:1-60L/min Interior diameter:0.81 inch Minimum rated working voltage:DC4.5 5V-24V Maximum current:15 mA(DC 5V) Working voltage range:DC 5-18 V Load capacity:10 mA(DC 5V) Operating Temp:80°C,Operating humidity:35%-90%RH Allow compression:Water pressure 1.20 Mpa below Storage Temperature:-25-+80°C Storage humidity:25%-95%RH F=4.8 x units of flow(L/min) x time(seconds). About the Wiring: Red Connect Positive; Yellow OUT Connect signal output; Black GND Connect Negative. SUitable for water purifier,water heaters,credit card machines,water vending machines, coffee machines,smart card equipment,the boiler and and other flow measurement devices! Caution: Prohibite dramatic impact and chemical erosion. Prohibite throw or hit. Vertical installation,inclination is no more than 5 degrees. Media temperature should not exceed 120 degree. Colour:Black material:plastic Package Contents: 4 x Water Flow Sensor