Description: Sensitive water alarm with 50cm water level detector wire, when there is water flow through the floater of wire, the alarm will generate a loud alarm sound (120-130db). WORKING PRINCIPLE: There is a floating ball on the alarm, which can be used to detect the water level. When the water level is higher than this position or lower than this position, an alarm sound will be given.When the water level is higher than this position, it is a full water reminder. When the water level is lower than this position, it is a water shortage reminder. Battery operated, powered by 9V battery (not included). No need wiring, comes with adhesive tape, easy to install, just place the alarm to where you want. Suit for machine room, swimming pool, water tank, fish aquarium tank, water purifier, etc. Specification: Material: Plastic Alarm Size: Approx. 9.7x4.5x2.2cm/3.82x1.77x0.87 inches Wire Length: Approx. 50cm/19.69 inch Power: 9V Battery (Not Included) Floater Length: Approx. 5cm/1.97 inches Package Includes: 1 Piece Water Sensor Alarm Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item.