This is a clever heat sensing mug that reads the level of your hot drink. With this smart design, one does not need to use a semi-transparent cup or peer over to find out how much of a beverage is left to decide whether to get a refill.

The battery bar also adds a nice touch for users living in the digital age, as the amount of coffee available relates to the amount of ‘power’ the mug contains. Works with drinks over 36 degrees Celcius (96.8 Fahrenheit). $28, buy from Art. Lebedev.