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AVONZZ Water tank Overflow Alarm is a small device which is easy to install in any kind of water tank. This Water tank Overflow Alarm is made up of virgin plastic and is white in color. The innovative water tank overflow works on 2 X AA BATTERIES . The sensor has to be kept at the desired level in the tank. The alarm rings and alerts you when the water reaches the set level in the tank. This efficient Water tank Overflow Alarm saves water and electricity. It also prevents your walls and roofs from the damage that is caused due to water overflow. package contents : 1 water overflow alarm unit 15 meters wire 2 sensors