Appliances that meet the standards of Underwriters Laboratories are UL certified or approved. Underwriters Laboratories is a nationally recognized safety certification organization that sets safety standards and runs tests on thousands of home and commercial products every year. UL Approved products feature the UL mark shown on the right and have met specific safety standards. The UL approved symbol does not necessarily mean that the product is suitable for outdoor use. If you are specifically looking for an outdoor appliance, please ensure that the product is listed as approved for outdoor use.