Whether the service agreement is legal or not depends on the content of your three-day training. If it is only pre-job training, job rotation training and general vocational skills development training arranged by the employer, the service agreement should not be signed; If it is professional and technical training, it is legal.

Labor Contract Law

Article 22 Where an employing unit provides special training fees and professional technical training for laborers, it may conclude an agreement with the laborers to stipulate the service period.

If the laborer violates the service period agreement, he shall pay liquidated damages to the employer in accordance with the agreement. The amount of liquidated damages shall not exceed the training expenses provided by the employer. The liquidated damages that the employer requires the laborer to pay shall not exceed the training expenses that should be shared for the unfinished part of the service period.