In places like South Africa, Mexico, and Hawaii, the pleasant experience of basking in the sun and surf is made unpleasant by the fear of shark attacks. The Sharkstopper wants to ensure open-water safety with an acoustically-based ankle device that repels sharks with the cries of their natural predator, the killer whale. The company eventually aims to market this technology to the commercial fishing industry to prevent the unnecessary deaths of sharks attracted by the big catches made by fishing rigs. For now, beach bums can protect themselves with their own in January 2015 for a cool $225, with the project’s creator looking to raise $48,000 by the end of the campaign.