Tested to shield 99.80% of electromagnetic waves by CIEMS in the United States testing and assay laboratories. EMR shielding effects are tested at laboratory to 9.735 GHz. 9.735 GHz is within the range of 5G which has been debated. Electromagnetic radiation is effectively harmonized, reducing the heat generation of your phone by more than 80%. Significantly reduces the heat generation of your phone and reduces damage to your ears. The less heat generates the longer the battery life and the retention time. Verified by clinical reports and certified by top class laboratories. 5G Protective Electromagnetic Wave Shielding: 0.06 inch (1.5 mm) thick. The smartphone cover fits effortlessly over the "5G Protective Electromagnetic Wave Shield". The surface area of the "5G Protective Electromagnetic Wave Shield" is 4 times the area of contact with smartphones and other appliances as well as similar electromagnetic wave chips, so it is highly efficient.