EASY TO USE - These stickers can be applied to phones, laptops, tablets, computers, TVs, and other small electronic devices. Simply place a sticker on the back of your phone or the surface of your electronic device. EFFICIENCY - Each sticker provides protection from EMF/EMR produced by phones, laptop cases, tablets, computers, TVs, and other small electronic devices. HOW IT WORKS - Standard electronic devices typically emit EMF (electromagnetic frequencies) and EMR (electromagnetic radiation), which can be harmful to humans. This phone protection sticker uses magnetic negative ion technology, absorbing and neutralizing ions present in EMF/EMR. SLIM DESIGN: The thin and lightweight design won't add bulk to your phone, and the ultra-thin design allows for easy application to your phone or any other electronic device. Take it with you wherever you go. Protect yourself and your family from radiation. Type: EMF Protection Sticker Color: Silver Material: Silicone Size: Diameter 28mm Package Contents: 20 x Sticker Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.