General business items are: Mobile phones and mobile phone accessories, auto supplies and auto accessories, mineral processing equipment, mining machinery accessories, ball mill grading production line, ball mill grading equipment and accessories, grader equipment and accessories, crusher and other crushing equipment accessories, elevator and elevator accessories, pulse dedusting equipment and accessories, collector equipment and accessories, feeder equipment and accessories. Technical R&D and sales of electronic products and consumables, security monitoring equipment, teaching equipment, multimedia teaching platform equipment, musical instruments, lighting and acoustics, stage equipment, printers, printing consumables, printing ink, and fire-fighting equipment; Sales of office supplies, office furniture, communication products, hardware products and equipment, lathes and peripheral products, sports equipment and peripheral products, household appliances and equipment, and kitchen equipment; R&D and sales of smart wearable products, smart watches, smart bracelets, and children's telephone watches. Domestic trade; Import and export of goods and technologies. (Except for items prohibited by laws, administrative regulations or decisions of the State Council and required to be approved before registration), the licensed business items are: