Braun Series 7 is a smart shaver that reads and adapts to your beard4 synchronized shaving elements shave in one stroke what others do in two*. *Proven on a 3 day beard. IPI research institute, February 2015Innovative Sonic technology helps capture even hard to catch hair with 10,000 microvibrations. ActiveLift trimmer captures flat-lying hairs in problem areasThe intelligent AutoSensing motor enables shaving even dense beards with ideal efficiencyFive Turbo/Sensitive Modes adjust the shaver for extra power or gentleness at the push of a buttonThe product is non returnable