This is part of my basement's power failure alarm and swamp system. My other water sensor alarm just wasn't loud enough to be heard much higher than a floor if you were awake; I needed something to wake me up from a deep sleep on the third floor. The system is powered by a 12 VDC power supply consisting of 8 D-cells; It activates the siren when there is a power outage in the house or when the water in the sump gets too high due to a pump failure. I really didn't know what sound to expect when I bought it and was pleasantly surprised to hear high-low whoops (each high-low cycle lasts about a second, so it's amazing and LOUD!). Very happy with the product, exceptional value for money and quality.
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