How does the L11 pro robot vacuum auto-empties itself?

"After cleaning, the robot will return to the charging base, and the robot will automatically empty the dust box.
 Note :
-The noise during auto-empty dirt is relatively loud,as loud as that of a normal vacuum is vacuuming.  
-Auto-emptying will be started when the robot starts charging, but it can not be started again within 5 minutes."
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