this is great, but it wont save any lives if no one is around or if the kids are expected to be playing in water. There was a death at a day camp in my neighbourhood last year; the kids were under watch, adults were swimming with the kids,but because of all the activity (outing at the pool for day-camps can get really crowded) the life guards did not spot the kid in distress and he drowned. A device like this that inflates when distress is detected would have save that life.