Zen-ergy Technologies, LLC ZEN-ERGY Balance Bands - for Power, Strength, Agility, Focus, Well Being, Positive Energy Flow Embedded with the full spectrum of Alpha wave frequencies for to aid with Healing and Restoration Protects your nervous electrical system from negative frequencies like radio waves & cell phones Medium size: 7.5" Circumference (190mm) Ideal for Smaller-Boned Adults Uses scalar energy first discovered by Nikola Tesla. Secret proprietary technology embedded in USA All natural; so, no negative side effects - Waterproof