EASY TO USE - These stickers can be applied to phones, laptops, tablets, PCs, TVs, and other small electronic devices. Simply place a sticker on the back of your phone or on the surface of your electronic device. EFFECTIVENESS - Each sticker is designed to help reduce exposure to EMF/EMR emitted by common electronic devices. WHAT IT DOES - Many electronic devices emit electromagnetic fields (EMF) and electromagnetic radiation (EMR). This sticker is designed to be placed on devices to help manage these emissions. The sticker features a built-in element that interacts with electromagnetic fields. Slim design: The thin and lightweight construction does not add bulk to your device. The ultra-thin profile allows for easy application on phones and other electronics. Portable and convenient for everyday use. Type: EMF Protection Sticker Color: Silver Material: Silicone Size: Diameter 28mm Package Contents: 20 x Sticker Note: Light and screen display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.