Review on Electric Lunch Box Food Warmer by David Burns

I've only used it a couple of times so far. What I noticed is that it just warms up the food instead of heating it. I did a test and poured 60°F cold tap water into it and plugged it into an outlet. It took him 2.5 hours to reach 137°. Today I plugged it into a 12V DC car outlet 1.5 hours before lunch with a half filled potato soup. It was warm at best. It doesn't get as hot as expected. It's better than eating a cold soup like I used to eat. I like the size of a tray design. The box looks solid enough, it just doesn't get hot.