New Warning System May Prevent Children From Drowning

High-tech device is designed to alert parent's smartphones if their child has been submerged for too long.
3:13 | 09/20/14

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Transcript for New Warning System May Prevent Children From Drowning
? It can happen in an instant, really. When it does, seconds count. The moment a child slips under the water and begins to drown. It's something every parent has nightmares about. A high-the tech device promises to turn your phone into a warning system. "Gma" investigates the iswimband. Here's Mara schiavocampo to tell us if it works. Reporter: Pool play. A favorite activity for children. Some parents teaching their kids to swim. Before they can even walk. But, fun in the water can also be very dangerous. Drowning is the second leading cause of accidental death for children. 88% happening even when a parent is present. But now, new technology could become an important tool in pool safety. This is the iswimband. And here is how it works. Your child wears it while swimming. If they're submerged for too long -- -- Your iPhone lets off a piercing alarm. Is the idea that time passes so quickly that it's easy not to notice your child is underwater. If you're barbecuing. Your friends are over. Yes. Absolutely. It's difficult to division between a child underwater playing and a child underwater drowning. A child are drown in as little at 20 seconds. Reporter: Parents can set the timer on the band from 10 to 30 seconds. Though the company says the alert can be delayed a few seconds to process. There's also a wristband with an even shorter interval. The wrist band is for a nonswimmer. Like a toddler. Given the higher safety risk, the alert goes off just seconds after it's submerged "Gma" investigates decided to give the iswimband a try. Good, that was right on the money. Reporter: With this aquatic safety expert and life guards standing by, the swimming uninstructor submerges himself into the water ten times for every interval that the band has. Only one time we had it on the money. Reporter: It sounded every time. But once on the money. The other, with a three to five second delay. It alerted. It was just a little delay. I think it could definitely help save lives. It's an added bonus. But swimming lessons and watching your children are paramount. Reporter: For "Good morning America," Mara schiavocampo, ABC news, New York. An adult should always be present and it's not meant to replace supervision. An extra security doesn't come cheap. It's $79. I think I might order a cup. Just for peace of mind. It's every parent's worst nightmare. It happens quickly.

This transcript has been automatically generated and may not be 100% accurate.

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