Wahl's Stainless-Steel Lithium-Ion Trimmer is truly an all-in-one grooming kit. It contains lithium-Ion 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. 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 8 guide combs to the t-blade head.