Description: Sensitive water leakage alarm with 3 probes on bottom, when there is water flow through the probes, the alarm will generate a loud alarm sound(120db) warning there is a water leakage. Measures 8cm in Dia. and 3cm in height, easy to hide and save pace with the compact size. Waterproof design, the alarm will float on the water surface as water goes up. Prevent the electronic components from damage. Battery operated, powered by 9V battery (not included), stand-by time can up to 1 years. No need wiring, easy to install, just place the alarm to place you want. Suit for bathrooms, basements, kitchens, boats, garages, workshops anywhere needs leakage-proof. Specification: Material: Plastic Size: Approx. 8x3cm/3.15x1.18 inch (Dia.xH) Power: 9V Battery (Not Included) Package Includes: 2 Pieces Water Sensor Alarms 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.