Some motor noise is normal during operation. Based on lab testing, the motor typically produces less than 45 dB at a distance of 1 meter, which is audible in a quiet office but quieter than normal conversation.
If the sound feels noticeably louder or more unpleasant than expected, please check the following:

Break-in period: New motors, or motors that have not been used for a while, may sound louder at first. Try using the stretch function a few times and see if the noise decreases.
 
Excess load: Extra weight on the chair or excessive resistance during adjustment can increase motor noise. Remove any additional load and test again.
 
Loose components: Check that the motor housing and mounting screws are securely tightened. Loose parts can cause vibration or resonance noise during operation.
 
If the noise remains unusually loud:
Please record a short video capturing the motor sound during operation and the chair’s condition, and note the testing distance if possible. Our support team will review it and assist with further diagnosis and support.