Widely used; Simple and easy to understand; Easy to use; Standby current 9MA; Working current 40MAWorking voltage: DC 12V (DC 10-15V); Standby current: 9MA; Working current: 40MA; Dimensions: 44mm X 29mm X 19mm; Maximum load: 10A/250VAC, 10A/125VAC, 10A/30VDC, 10A/28VDC, 10A/12VDCThere are two purposes for connecting the NO and NC ports of the relay: The water pump is connected to the automatic water injection tower at the COM NC port. The water pump is connected to the COM NO port and automatically pumps water from the water tower.Notes: The probe (wire) is not included in the package. No need to use special probes, use household wires to make probes. For safety, please use a well-isolated DC power supply.Application: Automatic water supply system for household water tower; Aquarium fish tank water changing system; Automatic filling of water tower; Automatic pumping of water tower; Conductive automatic control; Automatic feeding system for poultry and livestock; Farm automatic water supply system; And other occasions that require automatic water supply and water change; Solenoid valve water pump motor automatic control.Interface Description:HIGH: Upper limit probeOUT: output probeLOW: Lower limit probeDC+: positive power supplyDC-: Negative power supplyNC: Relay normally closed contactCOM: Relay common contactNO: Relay normally open contactWorking principle (automatic water injection tower):The water level rises: when the water level is lower than the "low level", the water pump starts to supply water to the water tower; when the water level is higher than the "high level", the water pump stops water supply.The water level drops: When the water level is lower than the "high level", the water pump does not work and the water level continues to drop. When the water level is lower than the "low water level", the water pump starts to supply water to the water tower.Working principle (automatic pumping of water tower):Contrary to "automatic filling of water tower"Colour: blueMaterial: plasticPackage Contents:1 * Controller moduleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.About UsWe provide the good product with the best price,we support Wholesale/Drop Shipping Order1. For Drop Shipping order, please remark"dropshipping order", we will prioritize it.2. For Wholesale/Drop Shipping orders, if you have any ideas about the price or package,please contact us in advance,we will give you the best service to satisfy your demands.About Shipments1.We will send out the orders ASAP once your payment is completed normally.2.Please write your complete delivery address with correct phone number and zip code, especially please confirm your full name.About After-sale ServiceWe are reliable seller and we have our professional after-sale service for all of our customs. If there is any question about the order,please contact us in advance ,we will always here until you get a happy answer.About Feedback1. Please check the package and item when you get carefully to make sure there is no problem.2. If you have any problem or are not entirely satisfied with your package,please don’t be hesitate to contact us first before leaving negative feedback. We will resolve the problem to satisfy you.25802. If there is no problem, please leave us five star positive feedback.Your affirmation is our greatest motivation ! ! !