Basement Water Alarm. Prevalert Water Leak Detector FULL Lifetime 100% Satisfaction Guarantee! 9v Battery Included (3yr Life) Prevent Costly Water Damage to Kitchen Bathroom & Basement. Similar to Basement Watchdog & BONUS Low Battery Alarm! 9 VOLT ALKALINE BATTERY INCLUDED - no need to buy a new battery for this unit for up to 3 years. LOW BATTERY CHIRP ALERT - when the battery is low the unit will sound to let you know to replace it. DETECTS WATER at less than 1/32 inch depth. Water only needs to be touching both sensors to alarm 100 HOURS of continuous sound at over 100dB loud to alert you of a water leak. Great Value! BUY this INEXPENSIVE insurance device today and AVOID COSTLY REPAIRS Also great for sumps and bilges