EASY TO - the stickers can be applied on phones, laptops, tablets, PC, TV and other small electronic devices. Just place a sticker on your the back of your phone or on the surface of your electronic device.EFFECTIVENESS - Each sticker can safely shield from EMF\/EMR produced by phones, laptop safe, tablets, PC, TV and other small electronic devices.WHAT IT DOES - Regular eletronic devices normally emit EMF (eletromagnetic frequencies) and EMR (electromagnetic radiation), which can be harmful to humans. Our cell phone protector sticker shield uses a magnetic negative ions technology, which absorbs and neutrilizes ions are in EMF\/EMR.Slim size: The thin and light body is not enough to make the phone heavy, and the new ultra-thin design allows you to put it on the phone or any other electronic device. You can take it with you you and your family from radiation.Type:EMF Protection Stickercolour:SilverMaterial:siliconesize:Diameter 28mmPackage Contents:20 x StickerOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +\/- 1-3cm.