Material: metalNet Weight: 7gModel: -28Main Color: blueOperating voltage: 3.3V~5V Dual output mode,analog output more accurateA fixed bolt hole for easy installation With power indicator (red) and digital switching output indicator (green)Having LM393 comparator chip, stablePanel PCB Dimension: Approx.3cm x 1.5cmSoil Probe Dimension: Approx. 6cm x 3cmCable Length: Approx.21cmInterface Description(4-wire):VCC: 3.3V-5V GND: GNDDO: digital output interface(0 and 1)AO: analog output interfaceInstructions for Use:Soil moisture module is most sensitive to the ambient humidity is generally used to detect the moisture content of the soilModule to reach the threshold value is set in the soil moisture, DO port output high, when the the soil humidity exceeds a set threshold value, the module D0 output lowThe digital output D0 can be connected directly with the microcontroller to detect high and low by the microcontroller to detect soil moistureThe digital outputs DO shop relay module can directly drive the buzzer module, which can form a soil moisture alarm equipmentAnalog output AO and AD module connected through the AD converter, you can get more precise values of soil moisturePackage Content: 1 x Soil Hygrometer Detection ModuleNote: Random color, don't accept the specified color.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.