This battery-operated Electric Coffee Grinder features an adjustable ceramic burr grinding mechanism that results in a fresh cup of coffee. The grinding mechanism is made from alumina, an advanced ceramic that will never rust--providing long-lasting performance. For any roast and brew method of preference, just add coffee beans to the hopper and adjust the grind from fine to coarse. With a press of a button, the grinder will start and automatically shut off and grinds are released into the base. Suitable for office, campsite or small kitchen.