Why does the Xiaomi Robot Vacuum S40C make an abnormal sound while charging?

If the Xiaomi Robot Vacuum S40C makes an abnormal sound while charging, please refer to the following information:
  1. It is normal for the device to produce some slight electrical noise during charging due to the flow of current;
  2. Make sure the charging dock is placed on a flat, stable surface to avoid vibration noise;
  3. Do not place the robot vacuum and charging dock near walls or furniture that can amplify the sound;
  4. Make sure that both the robot vacuum's charging contacts and the charging dock contacts are clean and free from dust, debris, or oxidation. Dirty contacts can cause unstable charging and unusual noise. You can gently wipe them with a dry cloth or cotton swab;
  5. If the noise is unusually loud or persistent, please check for any obstructions or contact after-sales service for further inspection.

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