This is just my opinion, but I would want one that not only has a loud alarm, but also is able to trigger some remote device (i.e. text mssg to a cell phone or pager), or have multiple alarm horns in various locations. I say this because, with just a poolside horn, its quite possible that if you are in the front yard mowing the lawn or something, you would not hear the alarm in the back yard.
Someone may be able to offer up better information.
Thanks,
J
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