The cheapest robovacs will only have a dock for charging. Pricier models incorporate self-emptying of the onboard dustbin, and draining/refilling of the onboard water tanks. The very fanciest models offer automatic mop pad cleaning, and detergent dispensing for the mopping fluid. The Eufy’s brush is supposedly anti-tangle — a cutting https://www.youtube.com/watch?v=Lhgk6D1ayeM&