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Descriptions: 1. The water flow sensor is light, nimble outline, small size and easy to install. The bearings used in the rotating part. All materials are in line with RoHS testing standards. 2. There is an integrated magnetic Hall effect sensor that outputs an electrical pulse with every revolution. The Hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry. 3. Three wire connection: red for positive, black for negative, yellow for pulse signal. Specifications: product name: water flow sensor material: plastic(shell) liquid temperature: not more than 60C working voltage range: DC 4.5V~18v rated voltage: DC 5V max current: 15ma(dc 5V) maximum water pressure: 0.8Mpa flow range: 0.3-3.0L/min connector: male xh-3p plug cable Length: 33 cm size: 65mm x 40mm x 22mm(l*w*h) external diameter of connector: 6mm mounting hole diameter: 4mm color: white net weight: 29G package included: 1 x water flow sensor.