The Stainless Steel Lithium-Ion + trimmer is wet/dry allowing you to use at the sink or in the shower. It comes with 3 interchangeable heads that allow you to customize your grooming experience. The Precision T-Blade is great for trimming the face, beard, sideburns, and necklines. The Precision Detailer helps provide touch up trims around the beard, nose, ears, and eyebrows. The Ear/Nose Trimmer head hygienically trims the hard to reach ear and nose areas. Attach any of the 8 individual guide combs to the t-blade trimmer head to evenly trim beard hair between 1/16"-1/2" or attach the 10-Position adjustable guide comb to achieve cutting lengths between 2mm - 11mm. This trimmer also contains Lithium-Ion + technology that provides a 3.5-hour runtime on an hour charge, a 1 minute quick charge for 3 minutes of use, and a low charge indicator. The built-in travel lock allows you to lock the trimmer, so it doesn't turn on in your travel bag, preventing the battery from dying on the way to your destination.