The Barbasol Mens Rechargeable Beard Trimmer W/Stainless Steel Blades features a built in adjustable position guide with 5 settings(3/16 inch-9/16 inch) with an easy click for achieving different lengths. The rechargeable battery has 8 an hour charge time that provides about 30 Minutes of shaving time. The washable heads can be run under water for easy cleaning.