Shandong Longertek Technology Co., Ltd. engages in the research and development, production, and sale of rail vehicle air conditioners, and control systems. Its products include tram air conditioner, trolley bus air conditioner, monorail vehicle air conditioner, new energy bus air conditioner, and digital energy intelligent environmental control products. The company was founded on April 7, 2000 and is headquartered in Jinan, China.