AVEX Highland Travel Mug AUTOSEAL lid automatically seals between sips to eliminate spills and leaks. Button toggles to lock, preventing the AUTOSEAL button from accidently being pushed while on-the-go Sleek design fits most car cup holders. One Hand Operation. Built In Lock Exclusive, patent-pending, dishwasher-safe base design grips table tops and reduces clanking Vacuum insulation keeps beverages hot for up to 7 hours or cold for up to 20 hours 100% BPA-free