The electric suciton has a foreign matter extraction buffering time during the suciton from the first stage to the second stage. And the visual performance will pause for 0.5 seconds during the suction process.
The door can be opened by pulling the door handle at any position during the suction process. When the outer door handle is opened for morethan 4 seconds at any time. the electirc suciton mechanism automatically realizes teh second unlocking.
