Shandong Longertek Technology (300594.SZ) stated on their investor platform that their main business focuses on the research and development, production, sales, and after-sales maintenance of railway vehicle air conditioners, new energy vehicle air conditioners, intelligent thermal management products, air energy heat pump drying equipment, digital energy intelligent environmental control products, and their control systems. Currently, their products are mainly used in fields such as railway vehicles, heat pump drying, new energy buses, energy storage systems, etc. Their products have not been applied to ships yet.