1、1.Made of engineering plastics and electronic components, it is resistant to aging and has a long service life. 2、2.You can adjust the alarm of high and low water level according to your needs. 3、3. sound and light alarm, and easy to maintain. 4、4.Use button batteries for safe and easy maintenance. 5、5.Put the alarm probe part into the water and adjust the height. When the water level is lower than the water level, the alarm will alarm. Used in aquarium water level monitoring, sump filtration monitoring sump water level and other applications. Features: 1. Made of engineering plastics and electronic components, it is resistant to aging and has a long service life. 2. You can adjust the alarm of high and low water level according to your needs. 3.sound and light alarm, and easy to maintain. 4. Use button batteries for safe and easy maintenance. 5. Put the alarm probe part into the water and adjust the height. When the water level is lower than the water level, the alarm will alarm. Used in aquarium water level monitoring, sump filtration monitoring sump water level and other applications. Specifications: Condition: 100% brand new Size: Approx Length and width 6.9*5*2cm/2.7*1.96*0.78inch line length 130-152cm/51.18*59.84inch Material:Plastic Scope of application: fish tank, aquarium Package list: Alarm *1 line *1 Notes: 1. Please allow 0-2cm error due to the manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.