- High quality soil sensor detects soil moisture with a nickel plated surface. Expanding the sensor area improves conductivity, prevents rust from ground contact, and extends service life. - High quality relays can withstand a load of 1500W, meeting the needs of most users. - Time delay function adds a 3-5 second delay when humidity is detected in a critical state, preventing relay flashing or strobe phenomena. - Wide range soil moisture regulation with adjustable threshold via potentiometer. When humidity is below the set value, the relay activates; when above the set value, the relay turns off. 2-3 practical use scenarios - Home garden irrigation automation: monitor soil moisture and trigger irrigation only when below the set threshold, with a short delay to reduce unnecessary cycling. - Greenhouse plant bed or potted plant moisture control: maintain stable soil moisture by preventing rapid relay switching and ensuring reliable water delivery when needed. - Lawn and landscape irrigation: deploy sensors across a yard or area, using the adjustable threshold to regulate irrigation and maintain consistent moisture levels without overwatering.