Electronic control provides for a soft start, overload indication for the correct height adjustment and motor shut off. The dynamically balanced roller and metal supports with ball bearings can be quickly replaced without tools. The RX is equipped with 4 rubber wheels as well as two side cylinders to glide flush with the wall. Two wear resistant stainless steel base guides provide a shockproof system. Two position operation provides easy transition over thresholds. Air and dust are highly filtered and special attention was given to the power nozzle with a washable entry/exit cooling air filter - easily replaced without tools. Cleaning path is 18 inches