Description: Sensitive water leakage alarm with 3 probes on bottom -- when water flows and touches the probes, the alarm will generate a loud alarm sound(120db) warning a water leakage Measures 8cm in Dia. and 3cm in height, easy to hide and save pace with the compact size Waterproof design prevents the electronic components from damage Powered by 9V battery (not included), stand-by time up to 1 year No need wiring, easy to install, just place the alarm where you want. Suitable for bathrooms, basements, kitchens, boats, garages, workshops anywhere needs leakage-proof Specification: Material: Plastic Size: Approx. 8x3cm/ 3.15x1.18 inch (Dia. x H) Power: 9V Battery (Not Included) 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 of the pictures and the actual item.