Automatic operation. Once its three contactors Touching water, it sound immediately with 85dB loud alarm;No buttons, no programming, just place it where you want to check water leakage; Water damage is one of the most common and costliest problems affecting homes. Even a small amount of water can cause serious damage to your home. Now with Water Leak Alarm, you have a way to know when and where you have a leak in your home before it becomes a costly problem. Place the Leak Alarm in any potential flood spot - next to bathrooms, basements, kitchens, boats, garages or etc. When the Leak Alarm detects even a small water leak, it sounds a very loud alarm and lets you know that you have a problem that needs your immediate attention. Leak Alarm Water Leak Detector - Warns you of a leak before it becomes a flood. Requires a 9-volt alkaline battery(not included),and normally a new battery can last for 1 year;Use by water heater, sink cabinet, sump pump, washing machine, radiators and more;Made of Plastics. It is specially designed to float in flood circumstances., Manufacturer: Jnchdghwa