The Automatic skimmer has built in lithium battery as well as solar powered module. Rehularly Solar is first choice, while if in bad weather, fast charging can be used in case. The pool surface cleaning skimmer's propulsion and rolling motor are brushless type which have high working efficiency and long service life. Smart Auto skimmer has automatic obstacle monitoring function, allowing its maneuverability and wall-sticking on the water surface , so that all corners of the pool surface can be cleaned well.