Good for 1 year blocks 99.5% of electromagnetic radiation. Boosts, Intensifies and Defends against non-ionizing radiation. To be placed on the back of any electrical device that is plugged into an outlet. Studies have shown that products such as Microwaves, Desktop Computers, Game Consoles, Head Phones, Smart Meters, Wireless Routers, Alarm Clocks, Vacuum Cleaners and even Hair Dryers emit harmful EMR’s. We advised to all buyers of electrical products to be aware of the long-term ill health effects of EMR radiation.