Smartworks Heated Auto Travel Mug Set, 12 V Dc Power Beverage Volume: 16oz 6.5 inches Tall x 3.25 inches Top Diameter, Tapers to 2.5 inches at Base 2 Mugs with 2 Power Cords. Insulated Stainless Steel Mugh with Loc-Top Lids. Tapered Base to fit into most auto cup holders Ergonomic Grip Handle. Plugs into Automobile DC Power Socket (Lighter Socket)