When it comes to productivity hacks, there are few better than a cup of coffee from one of the best coffee machines. But making the coffee is one thing, remembering to drink it at just the right time is another.That's where Ember comes in. I've been using the brand's mugs and tumblers for years now and they're a game-changer. If you frequently find yourself sipping on coffee that's either too hot (nobody wants a burnt tongue) or too cold (yet another trip to the microwave) then I recommend picking one up for yourself.I know it might seem a little bit exorbitant to spend over a hundred dollars on a mug, but think about how much use you'll get out of it. I'll easily get through four or five cups of coffee (or, mostly, tea) over the course of a day. And once you realise you can have it at exactly the temperature you like (for me that's 140°F) it's hard to go back.The Ember is made from premium ceramic, so it feels (and looks) good when you're using it, and the built-in battery will keep your drink warm for up to 80 minutes. If you leave it on the included coaster, then it'll stay warm indefinitely as the coaster doubles up as the device charger. The mug is IPX7 water-resistant but will need to be washed by hand rather than in the dishwasher.