Since all different modes rely on the same motor, you might expect them all to offer the same level of suction, but that's not quite the case. In robot vacuum mode, the E20 offers 8,000 Pa of suction power, but switch it over to stick mode, and you'll get a massive 30,000 Pa.

Robot vacuums are getting some outstanding upgrades this year, and ZDNET has picked the best ones of them all.

SwitchBot is showing off robot vacuums that can zoom around with air purifiers, tablet stands, security cameras, tabletops and other objects on top.