The lithium technology ensures sustained performance up to the last minute without loss of performance, with the Eco Smart charging technology the battery is charged in 6 hours, the charger then switches to trickle charging, transparent area to see how much dirt is in the container at any time can be opened at the push of a button without coming into contact with the dirt, shows the current charging status and thus the remaining running time, 3 levels with cyclonic action, 2 suction levels