Thermostatic Function: Use 5V3A charger, plug the mug in and it can be heated and insulated the entire time, and can heat cold water up to 140℉ and keep drinks warm. The heating time takes about ...

Most of the travel mugs we recommend come in multiple ... Temperature retention: To test heat retention, we filled each mug with water heated to 136 degrees Fahrenheit, the optimal temperature ...

And I can sip some, throw it in my bag, and save the rest for later. Most of the travel mugs on this list have temperature retention for at least a few hours — there are three exceptions ...

A lid comes with some heated coffee mugs, such as the Nextmug, or are available separately. These lids not only prevent spills, especially during travel or commutes, but also helps retain heat.