Wahl's Slate Stainless Steel Lithium-Ion Trimmer is truly an all-in-one grooming kit. It contains lithium-Ion 2.0 technology that provides a 3.5 hour runtime on a 1 hour charge, a 1 minute quick charge for 3-minutes of use, virtually no charge loss during storage, and world-wide voltage. The 4 heads are easily interchangeable. Use the t-blade trimmer head for beard grooming and touch-up trims, the dual shaver for close shaves, the ear/nose trimmer to trim hard to reach ear & nose areas, or the precision detail trimmer for fine detail trimming. To achieve even beard trimming lengths, simply attach any of the 9 guide combs to the t-blade head. This trimming kit has everything you need to help you get the look your looking for.