Features:

1. Historical Significance: In 1928, the birth of the steam-traction car by French innovator Quarr marked a pivotal moment in transportation history. While internal combustion engines eventually prevailed, many technologies from the steam car era, such as front-to-rear engine drive and independent suspension, continue to influence modern automobiles.

2. Superior Material and Craftsmanship: Crafted from metal using precision CNC casting techniques and finished with an oxidized aluminum alloy, these models exemplify meticulous craftsmanship. With 249 parts refined by professional grinding tools, they epitomize human ingenuity and the industrial era's spirit.

3. Mechanical Marvel: The intricate mechanical mechanisms are showcased in all their glory, highlighting the transmission process and demonstrating the beauty of meticulous logic and robust power.

4. Historical Simulation: Inspired by classic inventions and products, these models elucidate the core principles of machine operation, faithfully replicating historical milestones in human industry and technology.

5. Expandable Possibilities: Each product offers independent functionality and structure, allowing for upgrades, combinations, and transformations into power systems through designated kits or DIY modifications.

6. Engaging Assembly Experience: Users can disassemble and reassemble these models, providing an immersive experience reminiscent of professional assembly line techniques. The assembly process, lasting over 4 hours with a difficulty rating of 4.5 stars, offers a captivating and enriching journey.

7. Reliable Power Source: Powered by 500mAh Li batteries, these models offer a runtime of over 30 minutes on a full charge. With a 2-hour charging time, the Li battery ensures consistent performance, boasting an output voltage of 5V DC.