The DND mode is turned on by default, and the default period is 22:00-08:00. You can choose to turn off the DND mode or modify the DND period in the Mi Home/Xiaomi Home APP >> select [Xiaomi Robot Vacuum S20+] >> tap the three-dot icon at the upper right corner >> [DND period]. During the DND period, the robot vacuum will not actively perform cleaning tasks. It will lower the voice volume and turn off the indicator. The charging dock will not work. The scheduled cleanup will not take effect. [Cleanup resumption] will continue after the DND period ends.