Feature:1. For Water Control: This dual ball float switch has a simple structure that does not require external power supply or complex circuits, providing convenient liquid level control.2. Working Principle: The normal water inflow process is initiated by the lower float switch, the upper float switch stops working. Drainage is activated by the upper float switch and deactivated by the lower float switch.3. Simple Operation: If the demand control range is large, a combination of 2 float switches can be used to provide a larger stroke and ensure that the pump does not start frequently.4. High Sensitivity: The internal contacts of the water level switch use high sensitivity reed tubes to ensure stable operation, equipped with 400mm wire to ensure convenient connection.5. Wide Application: This water level float switch can be used to control the liquid level of water tanks, pools, sinks, fish tanks, etc., or as an alarm switch for the up and down of the liquid level.Specification:Item Type: Dual Ball Float SwitchMaterial: Stainless SteelSpecification: Approx. 100mm / 3.9inCable Length: Approx. 400mm / 15.7in.Package List:1 x Dual Ball Float Switch Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 585 hours Hope you have a pleasant shopping experience!