This neat little device allows you to cool your coffee if it’s too hot or reheat it if it gets too cold.

Coffee Joulies, small metal “beans” work by absorbing heat from the coffee three times faster than if it is left to stand alone and cool naturally. As the coffee cools further, the beans release stored heat to keep te coffee warm.

Reports indicate that the these magic beans, invented by Dave Petrillo and Dave Jackson, can continuously work to keep coffee’s temperature stable for up to five hours (though who leaves a coffee for five hours if it’s any good, you may be asking…).

But clearly, when faced with a boiling hot cup of coffee, dropping a couple of Joulies into the brew can allow you to enjoy your favorite beverage sooner and enjoy if for longer than would otherwise be possible.