Operational for more than 60 years, Carl's Jr. is one of the largest restaurant chains that operates more than 3,000 restaurants in the world. Its restaurants serve a variety of salads, burgers, desserts, beverages, sandwiches and side dishes. The chain operates Star Diner, which is a full-service restaurant on wheels that features charbroilers and refrigerators. Its restaurants use charbroiler-equipped vehicles for large promotions, such as school lunch programs, community fundraisers, street fairs, sporting events and concerts. Carl's Jr. also provides online information related to nutrition and food allergies. The chain s restaurants offer gift certificates of various denominations. It additionally provides online newsletter sign-up options, as well as nutritional calculators.