UL American Underwriters Laboratories (Underwriter Laboratories Inc.) shorthand. The UL Safety Test Institute is the most authoritative in the United States and is the larger private institution engaged in safety testing and identification in the world. It is an independent, profitable professional agency that conducts tests for public safety. It adopts scientific test methods to study and determine the degree of harm and harm to life and property of various materials, devices, products, equipment, construction, etc.; determine, formulate and issue corresponding standards and help reduce and prevent life-threatening Loss of property information, while conducting fact-finding business. UL certification is non-mandatory certification in the United States. It is mainly for product safety performance testing and certification, and its scope of certification does not include products.

  EMC (electromagnetic compatibility) characteristics.     It is mainly engaged in product safety certification and business security certification business, its ultimate goal is to obtain a market with a fairly high level of safety, and to contribute to the guarantee of personal health and property safety. Regarding product safety certification as an effective means to eliminate technical barriers to international trade, UL also plays an active role in promoting the development of international trade.