You may be asking..."what are planetary gears?" Well much like electric screwdrivers and automatic transmissions, this fun corkscrew uses planetary gears to obtain "Maximum Torque." It not only offers the best torque, but it is also fun to watch work... especially for all those gear heads out there. The cool transparent casing of the corkscrew allows the user and others to actually see the gears turn while opening your wine bottle. It works great on real as well as synthetic corks. Never struggle to open your wine bottles again! Foil Cutter is also included.