Its similar to a dog shocking system. the perimeter of the pool is outfitted with a cable, wire which is much like an antenna. The child will be out fitted with a small tag. Could be a watch/bracelet. a tag attached to the shoe laces, or even injected under the skin to make sure its always there.

When this tag is within a foot or two of the pool, it sets a trigger response. Instead of sending a shock like a dog collar, a near by hub (box)by the pool is alerted and it can sound an optional alarm but MOST importantly this system can call or text any persons # that is entered into the log.

This way if you put maybe the child's siblings #s, your neighbors #, and the parents #s, someone should be able to check on the child. Especially the parents if they don't realize their child is by the pool.

Its also non invasive enough that people wont disarm the alarm because its just annoying.

The alarm can be turned off for like an hour at a time so when the child is swimming by the pool it wont repeatedly call or text the #s.

also to prevent so many people from getting calls every time. it can just call the first person, and if they don't answer then proceed to calling the other #s on the list.

But this should prevent some deaths, and many parents are worried about having pools with small children. so this should eliminate a lot of the fear that their child would wonder out to the pool and drown.