[Tongtai] The company's board of directors approved a change in company address

1. Date of occurrence of the event: 2026/04/27 2. Company name: Tongtai Electronic Technology Co., Ltd. 3. Relationship with the company (please enter 'this company' or 'subsidiary'): This company 4. Mutual shareholding ratio: Not applicable 5. Reason for occurrence: The board of directors resolved to approve the change of the company's registered address. Before change: No. 123, Qingnian Road, Dajia District, Taichung City After change: No. 28, Dong Er Street, Dajia District, Taichung City 6. Countermeasures: Apply for registration change with the competent authority in accordance with the law. 7. Other matters that should be specified (if the subject of the event or resolution is a public offering company or above, this material information also meets the conditions of Article 7, Paragraph 9 of the Enforcement Rules of the Securities Exchange Act, which has a significant impact on shareholders' equity or securities prices): None.