This is the Sharkbanz Active Shark Deterrent Bracelet Band Magnetic Tech Features: EFFECTIVE - Technology based on proven science, published research and testing verified by an independent third party analysis group. SIMPLE - No batteries, no charging; always on AFFORDABLE - Safety for everyone STYLISH - Ergonomic design and premium materials for enhanced comfort Worn on Ankle or Wrist Universal Fit - Ages 5+ Dive, Swim, Surf - 100m/330ft TSA and Airline Travel-Friendly Magnetic Shielded Box for Safe Storage Weight: 3 oz. The world's first active shark deterrent band. Designed for beachgoers, swimmers and surfers, Sharkbanz use patented magnetic technology developed by marine biologists to deter predatory shark species. *Sharkbanz Technology has been verified by an independent third-party analysis group at the prestigious School of Coastal Environment Department of Marine Science at Coastal Carolina University. "