Parameter: 1) Working voltage: DC voltage 5 volts. 2) Working current: less than 35MA 3) Type: analog sensor 4) Test area: 40 mm x 18 mm 5) Working temperature: 10 ° C - 30 ° C 6) Working humidity: 10% - 90% without condensation 7) Fixed hole size: 3mm in the middle 8) 60 mm × 22 mm Applicable occasions: Design features of water level alarm: simple, easy to use, small size, light, high cost performance