[3 boards in 5 days Ultrasonic Electronics: "The ultrasonic electronic high-frequency board has passed NVIDIA certification" is not true. There are currently no products supplied to NVIDIA] On September 13th, Ultrasonic Electronics (000823.SZ) announced that the company's stock closing price increase deviation for 2 consecutive trading days has exceeded 20%, which is an abnormal fluctuation in stock trading. The company clarified that the market rumor that "ultrasonic electronic high-frequency board has passed NVIDIA certification" is not true, and no products are currently supplied to NVIDIA; the supporting PCB for 800G and 1.6T optical modules is in the follow-up stage of research and development, and there is uncertainty. It has not yet achieved large-scale supply and has not generated corresponding revenue. There have been no major changes in the company's fundamentals, and there are no major matters that should be disclosed but have not been disclosed by the controlling shareholder. The company reminds that the recent stock price has experienced a large short-term increase, the turnover rate is significantly higher than the daily level, and there is a risk of overheating of transactions. Investors are advised to invest rationally.