Please introduce the certification body UL.

UL primarily provides certification for access to the U.S. market and is also the developer of U.S. safety standards. The commonly mentioned UL certification can be understood as the UL certificate issued by the UL certification body based on UL standards. Other certification bodies can also issue U.S. safety certifications based on UL standards, such as ETL, cTUVus, etc. UL (Underwriters Laboratories) is a global safety science company that provides safety solutions aimed at promoting innovation, protecting lives and property, and maintaining the safety of global supply chains. Founded in 1894 and headquartered in Northbrook, Illinois, USA, UL is an independent, non-profit organization that develops standards and testing procedures to ensure the safety of products, materials, components, equipment, systems, and services. UL's services include safety analysis, certification, testing, inspection, auditing, consulting, and education. Its business scope is extensive, covering numerous industries such as consumer goods, electronics and electrical, building materials, life safety, environmental protection, food safety, water products, energy, and health sciences. As a well-known certification body, the UL mark is a globally recognized safety mark by consumers and manufacturers. The UL mark indicates that the product has undergone rigorous scientific testing and evaluation and meets specific safety requirements. Additionally, UL collaborates with government agencies, industry associations, and international standardization organizations worldwide to ensure that its standards and certification procedures meet the ever-changing market demands.