This sturdy process hazards sign is manufactured from 1-mm aluminum with a 0.20-inch mounting hole at each rounded corner for easy installation. It is printed in color with a gray background and English text to make your radio frequency message clear. This sign is UV, chemical, abrasion and moisture resistant and is suitable for use at temperatures from -40 to +176 F. ComplianceSigns signs and labels are made in the USA and commonly used in industrial, commercial, public and private settings. Full sign text is: WARNING RADIO-FREQUENCY RADIATION HAZARD EXISTS TO PERSONNEL WHILE RADIATING CONTACT OPERATORS BEFORE APPROACHING ANTENNA