There isn't really any caption information that explains this video but as far as I can tell these are a couple of vacuum cleaners. There is a music track playing in the background and the vacuum cleaners 'dance' to it. I can't tell if they are automated or someone is controlling them via a remote control. One modification they seem to have is the little multicolored white tube sticking out of the top of each one. On top of the tube seems to be a styrafoam ball which puffs up and down on a cushion of air blown out by the vacuum. These look much bigger than your standard Roomba so maybe they were prototypes or some such?