This accessory to our Water Leak Alarms is a MUST HAVE for anyone with a sump pump pit. Simply attach the Sump Overflow Detector to the bottom of any Gizmode Water Leak Alarm and then secure the Sump Overflow Detector in your sump pit just above the line where water is acceptable. If the sump pump fails or there is a power outage and water levels rise the Gizmode Water Leak Alarm and Sump Overflow Detector will give an early warning of the impending flood. It also acts as an overflow warning, bathtub full alert, and hot tub full alert. It's an easy way to increase your Water Alarms monitoring capability.