I've been using 12v travel mugs for about 20 years. This is the best I've found so far. Keeping my fingers crossed on its longevity. I like the digital temperature setting feature but there's no handle and it's not easy to drink out of. First time out I burned my lip. But I've gotten used to it. The lid allows it to act like a thermos so it wont leak. All the other mugs I've tried don't last very long. Some as little as a month. The cheap ones are too hot and the other ones with digital temp setting have inferior handles. The lids on all of them are easy to drink out of but leak.
Keeps coffee and other beverages warm/hot. Also good for keeping soup warm/hot. Very handy when traveling or camping. Simple and easy to clean and use. Although I haven't tried it yet, I could probably make ramen 🍜 in it. Just break it in two, place it in the mug, add water, turn it on high and let it cook.
I have owned several and all had issues. It has heat effected circuits causing failures to function properly and is easy to break! The cord fails after use for a while.
Keeps drinks at desired temp. Cord placement is right below where you drink from. It would be better on opposite side. Have only had for a short while so cannot comment on reliability.