Here's why the Wahl Lithium-Ion All-In-One Multigroomer is the perfect grooming kit for wet or dry usage! 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 features world-wide voltage. Use the T-Blade trimmer head for beard grooming and touch-up trims and 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.Waterproof allows for convenient wet or dry usage. 3.5 Hour run time allows multiple detail grooming on a single charge. LED light shows when unit is charged, charging, or needs a re-charge. The Smooth cut adjustable guide comb is designed to glide through the hair with rounded tips for complete comfort.