EASY TO USE - The stickers can be applied to phones, laptops, tablets, PCs, TVs and other small electronic devices. Just place one sticker on the back of your phone or on the surface of your electronic device. EFFECTIVENESS - Each sticker can safely protect from EMF/EMR produced by phones, laptops, tablets, PCs, TVs and other small electronic devices. WHAT IT DOES - Ordinary electronic devices normally emit EMF (electromagnetic frequencies) and EMR (electromagnetic radiation), which can be harmful to humans. Our mobile phone protection sticker uses a magnetic negative ion technology, which absorbs and neutralizes ions contained in EMF/EMR. Slim size: The thin and lightweight body is not heavy enough to make the phone heavy, and the new ultra-thin design allows you to put it on your phone or any other electronic device. You can take it with you. Protect yourself and your family from radiation. Type: EMF Protective Sticker Color: Silver Material: Silicone Size: Diameter 28mm Package Contents: 20 x Sticker Only the above package content, other products are not included. 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 +/- 1-3 cm.