There are lots of shark repellent products already on the market, some of them electric: https://www.hakaimagazine.com/news/many-shark-repellents-dont-work/ ht

There are lots of shark repellent products already on the market, some of them electric: https://www.hakaimagazine.com/news/many-shark-repellents-dont-work/ https://www.hakaimagazine.com/news/many-shark-repellents-don... And some of them magnetic, similar to those anti-nausea magnet bands. Some of them work, some don't. Just waiting for someone with a magnet on their ankle to get it bitten off and sue the manufacturer...