Powered by 4D-Blade technology. The innovative 4D-Blade has 2 central shaving zones and 2 side trimmers. It uses caged blade technology to protect the skin from the blade-for a comfortable shave that's close enough to look great while staying gentle on skin. The 4D-Blade is built to last staying sharp for up to 6 months*. It has a Flex head that adapts to your facial contours for easy and fast movement. 100% waterproof the 4D-Blade can be used at the sink and in the shower and is easy to clean for hygienic use at home. *Based on two face shaves per week actual results may vary One tool any style. Extend the lifetime of your Braun Series X with a new replacement blade every 6 months*. The innovative 4D blade is gentle on skin easy to use and makes every styling job simple.