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The annoying thing about coffee is that its ideal temperature is fleeting. Get caught up in a particularly lively debate in your morning meeting and by the time you return to your cup of joe, it’s cooled right down. That’s where Ember’s smart heated mugs come in, and right now one of its best models is $30 off.

The Ember Travel Mug 2 — this one is the 12-ounce variant — usually costs $130, but right now can be snagged for $100 when purchased online from Walmart. It can keep your beverage of choice at your preferred temperature between 120-145 degrees Fahrenheit for up to three hours on a full charge, thanks to the extended battery life. If that isn’t long enough, the included charging coaster can maintain optimum heat all day.

You can pair your mug with the Ember app to tweak the temperature (there’s also a touch display on the cup itself if you don’t want to open your phone), and this model also supports Apple’s Find My service, so you can locate it on your Apple device using the Find My app’s map if you misplace it.

The Ember Travel Mug 2+ is IP67-rated but bear in mind that it’s washable by hand only. This model is available in black.

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