Zircon 64003 Electronic Water Detector Sensor Alarm detects water leaks around water heaters, undersinks, or in sump pump areas. It operates on a 9-volt battery (not included) and produces an audible alarm with a sound level of 85 dB when it senses water. The device has dimensions of 2.4 inches in width, 4.28 inches in depth, and 1.38 inches in height, making it compact and easy to place in tight spaces. With an operating temperature range of 20 to 105 degrees Fahrenheit, it can be used in various environments. Weighing only 0.21 pounds, it is lightweight and portable. This water detector sensor alarm is a valuable tool for preventing serious water damage and ensuring the safety of your home.