Wahl Waterproof Stainless Steel Trimmer 24-Piece is waterproof, making it perfect for use in the shower or bath and features an innovative ultra-close T-Blade that’s designed with diamond-like coating to give you a smoother, cooler cutting experience. Powerful Lithium-Ion battery power gives you a 6-hour run time from 1-hour of charge, and 1-minute quick charge. Travel lock feature is designed as a safety feature for when storing or traveling – this feature locks your trimmer, so it doesn’t accidentally turn on.