Founded in 2021 as Polestones Automobile in Shanghai by entrepreneur Zhang Jin with backing from technology investor Xiaomi, Polar Stone specialized in extended-range electric SUVs. Its flagship Polestones 01, designed by Pininfarina, combined a 56 kWh battery pack with a 1.5-liter range-extender engine, delivering a combined 1,300 km energy range. The startup rebranded to Rox Motor in late 2023, emphasizing premium craftsmanship, AI-enhanced cockpit features, and rapid DC fast-charging support. Initial deliveries began in 2023, with 5,000 units sold by year-end. Rox plans to introduce the 02 coupe-SUV in mid-2024 and expand into Southeast Asian markets, targeting tech-savvy consumers seeking long-distance EV solutions.