Innovative Beard Sensor Technology: With Panasonic's Most Responsive Beard Technology* the ES-LV97 automatically adjusts power and matches your specific beard needs to reduce skin irritation by boosting or reducing power based on your beard density for a comfortable shave. *Panasonic Laboratory Stroboscope Testing, Japan. Auto Cleaning & Charging System for Easy Maintenance: When you finish shaving, put the shaver in its stand, press the switch, and it automatically cleans and charges itself. The shaver is thoroughly cleaned of beard clippings and sebum, helping keeping the blades sharp for longer. Ultra-Fast Motor for Powerful, Smooth Shaving: The Ultra-fast motor provides 70,000 cross cutting action per minute to provide an exceptionally powerful and smooth shave. Multi-Flex 16D Contour-Following Head: Shaver head moves in 16 directions independently* and follows the contours of the face and neck to reduce the number of strokes for shaving even flat-lying hair. *Panasonic Laboratory Report, Japan. 30° Nano Polished Inner Blades for Clean, Efficient Cutting: Ultra-sharp, 30 nano-polished inner blades enable cutting very close to the root to provide a superior and efficient shaving experience with a minimum number of strokes.