Brew it, boil it, reheat it. Whatever you need, the Cauldryn Travel Coffee Mug keeps things toasty. It’s a rechargeable battery-powered vacuum bottle that you program—via app or on the mug itself, to hit the perfect temperature all the way up to a boil; and it maintains that temp all day long. Plug it in to its power coaster, your car’s 12V power supply or run it off the battery, either way, your coffee will always be perfecto.