Goodyear 16 Ounce Stainless Steel Exterior Travel Mug with 12 Volt Automotive Adapter 16 oz. capacity 12 volt travel mug Stainless Steel Exterior Detachable 12 volt automotive cigarette lighter adapter allows you to heat and keep liquids hot during travel Tapered bottom allows mug to fit most automotive drink holders. Perfect for a late night drive or early morning road trips