Announcement on Business Transfer by Shenzhen Youzhun Precision Technology Co., Ltd.

Dear Partners, Customers, and Stakeholders:

In light of the company's business development and strategic integration needs, Shenzhen Youzhun Instrument Technology Co., Ltd. (hereinafter referred to as "Party A") and Shenzhen Youzhun Precision Technology Co., Ltd. (hereinafter referred to as "Party B") have reached the following agreement through friendly negotiation regarding the overall assumption of airtightness testing business:

1. Undertaking Entity Information

II. Scope of Acceptance

Party A confirms that, effective from the date of execution of this letter, it shall legally transfer all assets, rights, and obligations related to its airtightness testing business under its name to Party B. This includes, but is not limited to:

1. Intellectual property rights, including patents, trademarks, and software copyrights (subject to the patent certificate or application documents reflecting the change in right holder);

2. Business Performance (revenue, orders, customer data, etc., supported by audit reports, contracts, and invoices);

3. Customer Case Studies (3C electronics, medical devices, new energy, security and other industries, supported by winning bid/supply contracts and acceptance forms);

4. Supplier resources, procurement contracts, and pricing structure (subject to the fulfillment of supplier agreements);

5. Production equipment, jigs and molds, and fixtures (subject to the asset list and handover records).

6. Official website domain youzkxyq.com and ICP filing (Guangdong ICP File No. 2026128812-1, registrant updated to Party B);

7. Employee labor relations and social security (based on the labor contract and social security payment records).

III. Debt and Creditor Rights and Contract Succession

For sales contracts, purchase contracts, and other rights and obligations signed by Party A as of the effective date that remain unfulfilled, Parties A and B shall enter into a tripartite agreement with the counterparty to transfer all such obligations to Party B. If written consent from the counterparty is not obtained, Party A shall continue to perform, but all resulting benefits shall accrue to Party B. All new contracts entered into after the effective date shall be executed in Party B's name.

4. Intellectual Property and Confidentiality

Party A guarantees lawful ownership of the subject matter, free of any pledges, freezes, or third-party claims. Both parties shall keep confidential any business secrets disclosed during negotiations and handover; this obligation shall survive termination of this letter.

V. Representations and Warranties

Party A represents that the performance records, client case studies, and patent lists provided are true, accurate, and complete, with no false statements or material omissions. In the event of any inaccuracy, Party A shall bear full responsibility and compensate Party B and any third parties for all resulting losses.

VI. Effectiveness and Dispute Resolution

This letter shall become effective upon execution by both Parties and serves as a legal record of the business engagement. It may be presented by Party B to third parties, including purchasers, partners, or investors during due diligence. Any disputes arising from this letter shall be resolved amicably through negotiation. If negotiations fail, either Party may file a lawsuit with the competent court in the location of Party B's domicile.

7. Others

This agreement is executed in duplicate, with each party retaining one copy; both copies shall have equal legal effect. For any matters not covered herein, the parties may enter into a supplementary agreement separately.

Notice hereby.