Intelligent Sonic technology automatically increases power while shaving in difficult areas and on denser hairThe Series 7 electric razor comes with an ActiveLift trimmer that captures flat-lying hairs in problem areasOptiFoil cuts hair as short as 0.05mm for perfect closeness; Fully charged in 1 hourSynergized foil and blades give you a perfect shave with Series 7 razors100% waterproof shavers for easy cleaning. ActiveLift trimmer captures flat-lying hairs in problem areas