The general business items are: R & D and sales of electronic products, mechanical equipment, communication equipment and household daily necessities; Design and sales of clothing and ceramics; Jewelry design and sales; Domestic trade; Import and export of goods and technologies. Sales of class II medical supplies and devices (including the R & D and sales of medical devices such as masks, protective clothing, disinfectants, thermometers, etc. ) (can only be operated after obtaining the business record of class II medical devices). The licensed business items are: