Shark Repellants repell sharks buy creating an intense magnetic field that scrambles sharks electroreceptors. Like shinning a bright light into someones eyes or blasting a loud sound into someones ears. They are effective from 3-6 feet, require no batteries and last for decades with a special coating. They are recommended to be installed into the board for a stable magnetic field or somewhere like an arm leash. These Shark Repellants also fit inside the key pocket of the PDS bicep leashes so I'm making them available here for a very low price. "It is not recommended to put them on your ankel or loose in your pocket."