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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: copper(shell) liquid temperature: not more than 60C working voltage range: DC 4.5V~18v rated voltage: DC 5V max current: 10ma(dc 5V) maximum water pressure: 1.75Mpa flow range: 1-30l/min connector: male sm-3p plug cable Length: 33 cm size: 50mm x 30mm x 28mm(l*w*h) external and internal thread diameter: G1/2 inch tube Length: 50mm color: gold Tone net weight: 103G package included: 1 x water flow sensor.