In addition to car accessories designed for civilian cars, Hella also manufactures special signaling for official emergency vehicles. These include flash beacons and beacons (in blue and yellow), Visual Warning Systems (OWS) and all-round sound combinations (RTK). These are compact roof structures that combine the two blue lights, sirens, and possibly several additional issues. Police, emergency services, fire departments, agencies for technical aid and numerous other operators of deployment and use special vehicles use them. Also part of the product range of authorities, are headlights on the bumper and some other products (e.g., covert special signal for civilian emergency vehicles).