I have no experience with pool alarms, but having done service work for 30+ years, I have way more experience than I would like with all sorts of other alarms. And one thing they ALL have in common, is that they fail. Most commonly, they fail by alarming when they shouldn't but they also sometimes fail to alarm when they should.
When alarms fail ON, too much, people turn them off. But on the other hand you can never count on any alarm to always given the warning it should.
My point is, an alarm can be a supplemental safety. But it can't be primary.
If at all possible get a fence. If the pool is right next to the house, try to make the doors that access the pool self closing.
And, teach your 3 year old to swim AND to use the steps, ladder whatever. My own sons don't remember learning to swim, and they grew up not really understanding that you could stand on the bottom in some pools, because the pools we used were all deeper than their height when they were young.
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