All extra tools are stored on/in the device itself. It's convenient to have all tools in one place as you don't have to find a place to store them and they are right there when you need them.
AEG UltraOne AUO8840
Electrolux Oxygen Cleaner EL6988EZX
65% have it
16. Has electronic suction power controls
This system supports two-way communication between a microcontroller in the handle and a suction motor and various sensors in the canister. You can easily adjust the suction power for different floorings.