Time delay function: activates a deliberate 35 second delay after humidity is detected in a critical state to prevent relay flicker and reduce switching noise. Sensor durability and construction: uses quality soil moisture sensing components with plated construction and a widened sensing area to improve conductivity and measurement stability. designed to minimize soil contact wear and rust, extending service life. Flexible soil humidity control: supports a wide range of humidity control with an adjustable threshold via a potentiometer. when humidity is lower than the set value, the relay is activated; when humidity is higher than the set value, the relay is switched off. Reliable power handling: built with a quality relay rated to withstand loads up to 1500W, suitable for common irrigation and garden applications. Compatibility and durability: designed to work with standard soil moisture sensing systems and configurations, offering dependable performance in outdoor and indoor environments. Practical use scenarios: Greenhouse irrigation automation: maintain soil moisture by automatically turning irrigation on and off based on the detected humidity, with a 35 second delay to avoid rapid cycling. Home garden or potted plants: protect plants from over or underwatering by switching valves or pumps according to a userset soil moisture threshold. Lawn or small farm irrigation: control irrigation pumps or solenoid valves, leveraging the 1500W relay capacity for reliable operation in mediumload setups.