Rated operating voltage:DC4.5 5-24V Maximum operating current:15mA(DC5V) Flow range:2-100L/min Operating temperature range:≤80℃ Pulse characteristics:f=1.0*Q (F: frequency,Q:L/min) Type:Turbine flowmeter Water pressure:≤1.75Mpa Voltage:DC3.5-24V Caution: 1:No severe impact or attack is permitted 2:Do not throw or bump 3:Press the on the product to install 4:Medium temperature should not 80C. Only weak acid and water concentration of the same liquid Note: Red IN :Positive Yellow OUT: Signal output line Black GND:Negative pole Frequency calculation = Constant 1 * Unit flow rate (L / min) * Time (seconds) : Plumbing Coupling Type: Male BSPT Thread Type: Turbine flowmeter Feature: Hall Flowmeter Water pressure: Low 1.75Mpa Load capacity: Low 10mA Size:114*60*48mm Color: Black Material: Plastic Package Contents: 1 * Water Flow Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.