Widely used; Simple and easy to understand; Easy to use; Standby current 9MA; Working current 40MA Operating voltage: 12V DC (10-15V DC); Standby current: 9MA; Working current: 40MA; Dimensions: 44mm x 29mm x 19mm; Maximum load: 10A/250VAC, 10A/125VAC, 10A/30VDC, 10A/28VDC, 10A/12VDC Connecting the NO and NC ports of the relay serves two purposes: The water pump is connected to the automatic water injection tower at the NC COM port. The water pump is connected to the NO COM port and automatically pumps the water from the water tower. Notes: The probe () is not included in the package. No need to use special probes, use household wires to make probes. For safety reasons, please use a well-insulated DC power supply. Application: Automatic water supply system for domestic water castle; Aquarium water changing system; Automatic water castle filling; Automatic water castle pumping; Automatic conductive liquid control; Automatic feeding system for poultry and livestock; Automatic water