AQUARIUM WATER LEVEL ALARM WATERPROOF SENSOR The coating is made of high quality ABS material, which is durable and ma long service life. The international standard power cord makes fish safe and hassle-free and protects the health of fish. Double-sided adhesive ma strong adhesion, water resistance and high temperature resistance. One year service life, during which no ma need to replace batteries, you save worry and effort. The probe with suction cup is accurate. Water level detection is small and efficient. Specification: Item Type: Water Level Alarm Detector Battery: 3 LR44 button batteries (supplied with built-in battery) Battery capacity: 160 mAh Scope of application: Aquarium water level monitoring Tank water level monitoring, etc. Product size: about 7x5 cm/2,8x2,0 inch (error about 0,5 cm/0,01 inch) Probe cable length: Ok. 1,2 m/3,9 feet (with 1-2 cm/0,03-0,06 inch error) List of packages: 1 x water level alarm sensor 1 x Double Sided Tape 1 x Power Cable How to use: Insert the alarm probe into the water and adjust the height. When the water level is lower than the minimum water level or the water level is higher than the maximum water level, the alarm will sound. Note: During installation, the L point of the lowest water level probe must be at the lower end and the H point of the highest water level probe at the upper end. The alarm must not be placed in water ani soaked with water. Simply insert the probe into the water, replace the battery, recognize the positive and negative poles.