Interface size: 1/2inch(DN15) Working voltage range: DC 5-24V Medium temperature: -20°C-+100°C Water pressure resistance: ≤1.75MPa Output pulse high level: DC 4.5V (input voltage DC 5V). Output pulse low level: 100MΩ Flow range: 1-25 L/min ± 3% Tightness: Close each hole, add 1.7Mpa water pressure test for 1 minute without leakage and deformation. Flow pulse characteristics: 1/2inch External thread F=(8.1 x Q)±3% 1/2inch Female male thread F=(10 x Q)±3% Q = L/Min. Wiring mode: Red IN is connected to the positive pole Yellow UOT signal output line Black GND connects to the negative pole Colour:Gold Material:Brass Package Contents: 1 x Water Flow Sensor Only the above package content, other products are not included. Note: Light reflection 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.