This Hart 1/4 Impact Driver, a handy tool with the power of a Hulk, comes with 2 batteries - doubling your 'screwdriving' hours while halving your 'screaming' hours. Ran out of gas on one? Flip the switch, and voila, in comes the backup. Plus, a charger sophisticated enough to make your smartphone feel old-school. Now, screw those loose bolts like never before or also perform some impromptu dental work on your nemesis - choices are limitless!