This device is absolutely needed in any home. We had one but it got old and went bad, so this device replaces our original. It is much easier to operate than was our old one. It is about the size and shape of a smoke detector and mounts on the wall with 2 screws. It requires 3 AA batteries. I hope we never need it, but it gives our family peace of mind.
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https://www.amazon.com/gp/product/B0799L4RBG