Are you sensitive to energies? This keychain is the portable version of the Power P.E. Bal and uses scalar wave technologies to shield you from EMF bombardment while you are at your office, in your car, or shopping. It uses scalar wave technologies, also known as Tesla Waves. This is a must have for anyone who is sensitive. It’s compact and powerful, with a range of approximately 100 feet radius. Measures 1.25 inches.