Control Products WS-04 WaterSiren Plus
Water sensor sounds an 90 decibel alarm if water is detected by detachable sensor and closes an alarm contact that allows it to trigger the Deluxe FreezeAlarm's auxiliary alarm contact or any other type of alarm system's normally open alarm contact.  Low battery chirp reminds you to change the battery if it gets too low.  It's easy to install "peace of mind".