Basement Pump Water Alarm – Mains is a warning system which alerts the end user when there is: Low Voltage High Water Alarm. Sensor, that detects water, and alarm connected by 6ft of wire. Powered by 9-volt battery (not included). 85-decibel alarm can sound for 3 days. Key Features: • Remote sensor detects water and sounds alarm • Sensor and alarm connected by 6-Feet (1.83m) of wire • Solid State electronics powered by 9-volt battery (not included) • 85-decibel alarm sounds for 3 days • Low battery check and a test bar for a system check