1. Revocation Clause: Include when the authorizing party wants to explicitly state their right to revoke the authorization and the process for doing so

2. Indemnification: Include when the authorized party needs protection from potential claims arising from their authorized actions

3. Sub-delegation Powers: Include when the authorized party needs the ability to delegate some or all of their authorized powers to others

4. Governing Law: Include when the authorization might be used in multiple jurisdictions and Hong Kong law needs to be explicitly stated as governing

5. Chinese Translation: Include when the letter might be used with Chinese-speaking parties or authorities

1. Specimen Signature: Sample signature of the authorized party for verification purposes

2. List of Specific Powers: Detailed enumeration of specific actions or powers being authorized, if too extensive for main letter

3. Identity Documents: Copies of relevant identification documents of both parties

4. Corporate Resolution: If the authorizing party is a company, include board resolution or similar corporate authorization