Just wanted to pass along my results from some testing I've been doing this morning.
I didn't want to spend a bunch of money on a pool alarm. We live out in the middle of no where (5 acres), and have the AGP configured as an IG (deck will be built in the coming weeks.)
My kids are 12 and 10, and we don't have any neighbor kids. Worst case for us is really a deer or the dogs getting into the pool.
So, I found this: http://www.harborfreight.com/wireles...tem-93068.html.
I actually got it when it was on sale for $10, but still $20 is a pretty good deal. I set it on the little temporary deck to the pool I have and set the mini dachshunds loose. Within about 15 minutes, I had forgotten about them and the alarm, and BING BONG>>>BING BONG...off it went. I looked out, and the little 5 pounder was on the deck about to look into the pool.
So far, NO false alarms. Runs off C and 9v batteries, which is strange, but workable.
The plan for me is to just set the sensor out when company comes and put the receiver in the kitchen (you can actually hear it from outside, the the dogs after the 4th or 5th time are having a Pavlovian response to it, and running from the pool when they hear it,) so that if any little ones cross the "line" to the pool, we'll know it (basically, if they get up on the pool deck.)
Supposedly, it's got a 400ft range. I'm about 80' behind steel siding, and no problems at all so far.
Hope this helps someone else. BTW, please no comments on "you absolutely HAVE to have a pool fence, and big monsters are going to come take you away if you don't." We debated quite a lot on the pool fence, and decided against it. The alarm is a secondary device, I also have webcams out there and all that.