Some of the features that make 2 Wheel POOLCLEANER unique:SELF ADJUSTING TURBINE VANESAll the POOLCLEANER cleaners have the patented self-adjusting turbines, which maximizes the power from the water flow. This turbine is similar to a paddle wheel with blades that are adjustable. This feature allows the POOLCLEANER to still move at low suction and low pressure. In addition the folding vanes of the turbine allow for the easy passage of larger debris through the cleaner. STEERING SYSTEMThe 2x Suction POOLCLEANER has an internal programmed steering system, that causes the left wheel to periodically reverse, allowing the POOLCLEANER to turn and then move into another direction. For the 2x Suction POOLCLEANER there are five different programmed turns ranging from 90 to 450 degrees. This feature allows the POOLCLEANER to cover not only the deep end, but also the shallow end.