The main cleaner (water), with its charging/cleaning deck and two washing rollers. Then there's the dust cleaner (bin + filter) and the different accessories: sweepers, dust nozzle and 'mini' brushes for fabrics, also a mini deck (non-electric). The electrical part (vacuum and battery) is interchangeable between the two but can only be rechargeable on the main (water) cleaner.
It's quick to switch between the two systems, but first and foremost it's a water-based floor cleaner. The dust extractor is an accessory (very practical) but it is not ‘independent’.