Usage Tips:EASY TO USE - 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 that are present in EMF/EMR. Slim size: The thin and light body is not enough to make the phone heavy, and the ultra-thin design allows you to put it on the phone or any other electronic device. You can take it with you! Protect you and your family from radiation. Type:EMF Protection Sticker colour:Silver Material:silicone size:Diameter 28mm Package Contents: 10 x Sticker / 15 x Sticker / 20 x Sticker Only the above package content, other products are not included. Note: Light shooting 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.