All of Ember’s self-heating mugs are 20 percent off right now

Ember’s fancy-schmancy smart mugs are all discounted on its site through August 13th as part of the company’s back-to-school sale so you can prepare for the cooler months ahead well ahead of time. While the current promo takes 20 percent off the Ember Tumbler, Cup, and Travel Mug 2 (with code B2S20), our collective favorite here at The Verge is the Ember Mug 2 — which is on sale in both its 10- and 14-ounce sizing direct from Ember, with other retailers matching.

If you’re shopping for the Ember Mug 2, you can get the 10-ounce version in black at Amazon for $102.22 (around $28 off), at Best Buy for $103.99, or direct from Ember for $103.96 (with code B2S20). As for the 14-ounce model, the white version is down to $118.99 (about $31 off) at Amazon, while the exclusive blue model is going for $119.99 ($30 off) at Best Buy. Ember, meanwhile, is offering all the standard colors for $119.96 when you use offer code B2S20.

Ember products are not exactly a necessity, but if you don’t mind the splurge, they’re very convenient — especially for big coffee or tea drinkers who work from home. The mug pairs with your phone via Bluetooth, allowing you to dial in your desired temperature via the Ember app. While the Mug 2 only maintains that temperature for up to 90 minutes on battery (depending on the size), it will keep things heated indefinitely while docked on the included charging coaster. That’s especially nice if you’re the type (like me) that often pours a hot cup of coffee and forgets to touch it until it’s well passed lukewarm.