DECEN USATK62823 Coffee Grinder, Black NO POWER NEEDED: Doesn't need any batteries or power cords,making it very quiet to operate UNIQUE DESIGN: Coffee bean grinder with sturdy comfortable non-slip grip are designed for easy grinding ADJUSTABLE COFFEE GRINDER: This coffee grinder can adjust the thickness of grinding easily based on personal taste EASY TO CLEAN: portable and lightweight coffee grinder make it convenient to clean and safe for dishwasher QUALITY ASSURANCE: Backed by Decen's 100% satisfaction guarantee and Money Back Promise compared with similar items