Never over fill your bathtub or sink again. If you have ever flooded a room in your home because you forgot you were filling your bathtub or sink, then you need this alarm. Simply hang the device on the side of your tub or sink by using the handy suction cup, adjust the height to the desired water level and walk away. The Bathtub Alert will alert you when the water has achieved your preset level by sounding a loud but pleasant series of beeps.