Material: metal_x000D_ Net Weight: 7g_x000D_ Model: FC-28_x000D_ Main Color: blue_x000D_ Operating voltage: 3.3V~5V Dual output mode,analog output more accurate_x000D_ A fixed bolt hole for easy installation With power indicator (red) and digital switching output indicator (green)_x000D_ Having LM393 comparator chip, stable_x000D_ Panel PCB Dimension: .3cm x 1.5cm_x000D_ Soil Probe Dimension: . 6cm x 3cm_x000D_ Cable Length: .21cm_x000D_ Interface Description(4-wire):_x000D_ VCC: 3.3V-5V GND: GND_x000D_ DO: digital output interface(0 and 1)_x000D_ AO: analog output interface_x000D_ Instructions for Use:_x000D_ Soil moisture module is most sensitive to the ambient humidity is generally used to detect the moisture content of the soil_x000D_ Module 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 low_x000D_ The digital output D0 can be connected directly with the microcontroller to detect high and low by the microcontroller to detect soil moisture_x000D_ The digital outputs DO shop relay module can directly drive the buzzer module, which can form a soil moisture alarm equipment_x000D_ Analog output AO and AD module connected through the AD converter, you can precise values of soil moisture_x000D_ Package Content: 1 x Soil Hygrometer Detection Module_x000D_ Note: Random color, don't accept the specified color._x000D_ 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. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_