I have the maytronics swim alert. I have been happy for 2 years, I have a 4 year old and a 6 year old, works every time I forget to disarm it, it's very loud! It has bad reviews on amazon, but it was recommended by good housekeeping which was where I learned about it. It will give false alarms sometimes when the wind gets over 25 mph, but not always. I adapted it to an above ground pool by mounting a piece of plywood, cut to the shape of the bottom of the alarm, between the alarm and the pool. Hope this helps.