Control Products WA-5001 WaterAlarm Plus 90 decibel alarm provides quick alert if you're home. Automatically calls any one phone number to alert you of a water emergency when you're not home. Detachable water sensor can be placed on floor, inside the lip of a sump, near a water heater, washing tub or machine, or near any plumbing fixture. No monitoring fees or costly installation. Operates on batteries and uses your existing telephone line. Continues to call you until you acknowledge the alarm. The audible alarm sounds for up to 36 hours.