Easy to Use - The stickers can be pasted on mobile phones, laptops, tablets, computers, TVs, and other small electronic devices. Just attach the stickers to the back of your phone or the surface of your electronic device. Effectiveness - Each sticker can safely protect EMF/EMR generated by mobile phones, laptop cabinets, tablets, computers, TVs, and other small electronic devices. What it Does - Common electronic devices usually emit EMF (electromagnetic frequency) and EMR (electromagnetic radiation), which are harmful to the human body. Our mobile phone protection sticker uses magnetic negative ion technology, which can absorb and neutralize the ions present in EMF/EMR. Slim Size: The thin body isn't enough to make your 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 Protection Sticker Color: Silver Material: Silicone Size: 28 mm in diameter Package Contents: 20 x Stickers Only the above package content, other products are not included. Note: Light and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The allowed measurement error is +/- 1-3 cm.