CAUTION EAR PROTECTION MUST BE WORN IN THIS AREA - Warn personnel that ear protection will be required if working in the marked area. Sign available in many different sizes to suit needs of workspace. Available with adhesive backing for easy application. Traditional OSHA-style signs, tags and labels are the most widely recognized design format in the industry. Caution header indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.