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The Thermacup Premium is a 12 oz stainless steel mug with a built-in heating element and rechargeable battery, so it holds your coffee at a set temperature instead of letting it cool. It has no app or Bluetooth, which keeps it simpler than app-controlled rivals like the Ember Mug, but it also offers less control. Owners like the solid steel build and the personalization option, which makes it a common gift. It suits desk workers, commuters and anyone who sips slowly and hates reheated coffee.
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Lowest price we've seen: $59.99 on Nov 9 at eBay. Tracked across 3 stores since Nov 9.
Rated 4.7 from 966 ratings, owners mostly praise the steady heat and solid steel build. Complaints center on battery life and the lack of app control compared with pricier smart mugs.