【Huayu】Announcement Regarding Endorsement Guarantee Information for Dongguan Tailin Electronic Communication Co., Ltd.

1. Date of occurrence of the event: 2026/05/08 2. Details of the guaranteed party: (1) Company name: Dongguan Tailin Electronic Communication Co., Ltd. (2) Relationship with the company providing the endorsement guarantee: Our company's 100% indirectly held subsidiary (3) Endorsement guarantee limit (in thousands of NTD): 469,915 (4) Original endorsement guarantee balance (in thousands of NTD): 62,800 (5) New endorsement guarantee amount (in thousands of NTD): 94,200 (6) Endorsement guarantee balance as of the date of occurrence of the event (in thousands of NTD): 157,000 (7) Actual amount drawn by the guaranteed company (in thousands of NTD): 0 (8) Reason for this new endorsement guarantee: The original credit line expired and was renewed. 3. Collateral provided by the guaranteed party: (1) Content: None (2) Value (in thousands of NTD): 0 4. Latest financial statements of the guaranteed party: (1) Capital (in thousands of NTD): 376,146 (2) Accumulated profit/loss (in thousands of NTD): -43,521 5. Release of endorsement guarantee liability: (1) Conditions: Release of bank credit line (2) Date: Date of release of bank credit line 6. Total endorsement guarantee limit (in thousands of NTD): 469,915 7. Endorsement guarantee balance as of the date of occurrence of the event (in thousands of NTD): 157,000 8. Ratio of total endorsement guarantee balance provided by A to net value of the public company's latest financial statements as of the date of occurrence of the event: 16.71% 9. Ratio of total endorsement guarantee, long-term investments, and capital loan balance to net value of the public company's latest financial statements as of the date of occurrence of the event: 28.99% 10. Other matters to be specified: None.