They are two different versions that do not differ much. The Tineco vacuum cleaners One S5 and One S5 Pro are visually similar. Both wet and dry vacuum cleaners are available in grey and have an elegant, modern design. The water containers of the Tineco washing vacuums are the same size and the vacuums themselves are the same weight. The S5 Pro has only the dirty water tank on the front, while the fresh water tank is on the back. Its dirty water tank is relatively dark in colour, so it is difficult to see through dirt. The vacuum cleaner has no electrolyte cleaning function