Specifications:
Frequency: F=7.5 * Q (L / Min) error: ± 2% , current can not exceed 10mA, 450 output pulses/liters. F=onstant * units of flow (L / min) * time (seconds)
Flow range:1-30L/min
Maximum current:10 mA(DC 5V)
Working voltage range: DC 5-18 V
Load capacity: ≤10 mA(DC 5V)
Operating Temp: ≤80℃.
Operating humidity: 35%-90%RH
Allow compression: Water pressure 1.75 Mpa below
Insulation resistance: >100M OHM
Storage Temperature: -25-80℃
Storage humidity: 25%-95%RH
Output Waveform: Square Wave,output pulse singal.
Cable length:120cm.

Refer to the wiring:
Red wire: VCC(+)
Black wire: GND(-)
Yellow wire: Signal output
Package include:
Flowmeter x 1