The Mint, perhaps unavoidably, might be best defined by the ways it differs from the Roomba. It's a smaller, squarer machine that sweeps and mops instead of vacuuming or scrubbing. Its movements are guided by a separate sensor placed somewhere in the room to be cleaned, and the robot and sensor communicate to establish a map of the area. After this discussion, the Mint cleans in a methodical zig-zag pattern, returning to its starting location when it confirms that it has covered every inch of the room. It can both sweep and mop, depending on which cloth is snapped on and which setting is selected.