1. Water Detector: The water has two parts, alarm body and probe adhered to a sucket cup. Once the probe is soaked by water, alarm sounds. 2. Easy Use: Juck suck the sucket cup to the inside of fish for glass(adjust the positon by your own demand), leave the alarm body outside. When the feet of the detector was immersed by will give alarms. 3. Simple Maintain: The water leak is powered by replacable button battery. If not working well, disassemble the back for shell, check the battery, whether the motherboard plug is loose. Fasten the plug or replace the battery will solve problems. 4. Wide Application: Suitable for aquarium fish for water , home for water , sump water , and other applications. 5. : engineering and electronic components, it is resistant to aging and has a long service life.