Legal analysis: it has legal effect and needs to be satisfied: the letter of commitment is the true expression of one party, and the content of the letter of commitment should be the expression of the true meaning of the party, not coercion, threat, temptation or deception; The content of the undertaking does not violate the relevant provisions of laws and regulations; The content of the letter of commitment does not violate the principle of public order and good customs, and the promisor can only dispose of it based on what he has the right to dispose of, but not infringe on the legitimate interests of others.

Legal basis: Article 484 of the Civil Code of People's Republic of China (PRC), the acceptance notice takes effect when it reaches the offeror. If the acceptance does not need to be notified, it will take effect when the acceptance is made according to the requirements of trading habits or offers. Where a contract is concluded in the form of data messages, the time of acceptance shall be governed by the provisions of the second paragraph of Article 474 of this Law.