Description: 【Functionality】: This water level alarm is designed to alarm you immediately When the water level is lower or higher than the preset water level, allowing you to take timely action. have normal open or close mode 【High sensitivity】: The DC12V Water Leak Alarm with High sensitivity ensures prompt response, Integrated fully sealed design 【Material】: Made of Zinc alloy and stainless steel  material that ensures longevity and reliability even in constant contact with water. 【Dimensions】: Compact size measures 4.7cmx3cm/1.85inchx1.18inch in size makes it easy to install in any corner of your tank or pool without taking up much space 【Wide Application】:Water Immersion Detector is Ideal for use in server rooms, communication base stations, hotels, restaurants, libraries, warehouses, home center Specification: Wiring instructions: Red is the positive pole of the working power supply +12VDC, black is the negative pole of the working power supply -12VDC, yellow is the normally closed output, no polarity difference, blue is the normally open output, no polarity difference, brown is the common end, no polarity difference. Size Chart: 4.7cmx3cm/1.85inchx1.18inch Package Includes: 1 set Water Level Alarm  Note: Please allow slightly errors due to manual measurement and different monitors.