Wahl's Lithium Ion Aqua Blade Wet/Dry Trimmer provides skin close trimming, shaving, & edging. With a lifetime blade warranty, the extreme precision blade is the only blade you'll ever need. The trimmer is also wet/dry, so it can be used both at the sink and in the shower. It also contains lithium-ion technology that provides a 2.5 hour runtime on an hour charge and a 3 minute quick charge for 5 minutes of use. For longer beard trimming, you can add any of the included 8 guide combs for even cutting lengths. This trimmer has everything you need to achieve the beard style you want.