Core Viewpoint - Longjin Technology (300594.SZ) has established itself in the variable frequency drive and intelligent control sectors, holding patents related to IGBT module drive circuits, and is recognized for its energy-saving air conditioning products that utilize variable frequency control technology [1] Group 1 - The company possesses core technology in variable frequency drives and intelligent control [1] - Longjin Technology has obtained relevant patents for IGBT module drive circuits [1] - All products developed by the company are energy-saving air conditioning units that apply variable frequency control technology [1] Group 2 - The technology level and energy-saving effects of the company's products have been widely recognized by industry clients [1] - The company owns production and testing equipment for IGBT modules, with some modules being produced for internal use [1] - Longjin Technology will continue to invest in research and development to enhance its technology and product quality [1]