Start refers to the humidity is lower than the setting humidity when the soil moisture is less than setting humidity, the relay will automatically suck, start the spray, the place such as pumps do humidification, automatic stop when set the humidity is reached.
Electrical parameters:
voltage: 12V DC;
input current: More than 100MA;
load: 250V 10A AC or 30V 10A DC (below this all can be used within the scope of the current)