Ember Temperature Control Smart Mug 2.

The Ember Temperature Control Smart Mug 2 is the premium pick if you want app-controlled precision from the first sip to the last. You can set 120°F to 145°F, it defaults to 135°F without the app, and it delivers about 90 minutes of battery heat (or all-day heating on the charging coaster) with smart sensors and auto-sleep.

Pros

+App-controlled temperature range: 120°F to 145°F
+Works without the app and remembers last setting
+Up to 90 minutes of battery-powered warmth
+All-day heating when placed on charging coaster
+Smart sensors and auto-sleep help conserve battery
+Handwash safe and submersible up to 1 meter
+LED indicator shows when drink is at the right temp

Cons

-10 oz capacity is smaller than most alternatives
-Battery-only heating time is shorter than some competitors

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Ember Temperature Control Smart Mug 2.

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Highlights

+App-controlled temperature range: 120°F to 145°F
+Works without the app and remembers last setting
+Up to 90 minutes of battery-powered warmth

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