Model: FC-28-C - Quantity: 1 piece - Color: Blue - Material: PCB - This is a simple soil sensor can be used to detect soil moisture when the soil moisture deficit module plant watered device so that the plants in your garden without people to manage - Adjustable sensitivity adjusts the digital potentiometer (shown in blue) - Features time delaying function about 3~5 seconds when it detects humidity in the critical state relay will not flash turns to quick flash - With time displaying function after adjusts humidity value need to wait for 5~8s the green LED indicator will change until adjust the humidity value to the your need - Packing list: - 1 x Soil moisture control module - 1 x Soil humidity sensor - 2 x Dupont lines