EMR SHIELD Radiation Shielded Back Plates for Mobile Phones and Tablets. The EMR SHIELD is an EMR radiation protection shielded back plate for your mobile device. It creates a shield from high frequency electromagnetic radiation (30 MHz - 18 GHz) emitted by mobile (cell) phones and tablets, providing an astonishing electromagnetic shielding of 80 dB. It is placed (wedged) between your device and your device's-case. The EMR SHIELD products have been certified from Emer. Professor Lukas H. Margaritis (Department of Cell Biology and Biophysics at University of Athens, Greece). EMR SHIELD is the THINNEST RADIATION PROTECTION DEVICE IN THE WORLD with a thickness of just 0.25 mm (or 2.5 tenths of a millimeter). They are a Greek initiative and are designed and produced in Greece.