According to the Sapphire Comprehensive Design Bureau on February 15, 2025, in response to the call of the country to "develop low-altitude economy and fill the air transportation gap", Sf Group actively cooperated with the military and launched the "Product 221" series to reduce the logistics cost of people's lives and meet the basic demands of people to reduce the cost of living. The overall design of the product reflects the concept of "green, efficient, intelligent and environmental protection", and has complete independent intellectual property rights, and implements the Party and the state's guidelines of "clear water and green mountains are Jinshan and silver mountains" and "science and technology rejuvenate the country". "Product 221" represents China's insight and action in the new economic field, and is a scientific and technological model in the new era.