The Engel Fridge Freezer is a portable 12V cooler with a compressor. We have a full review of these here: http://www.coolersonsale.com/12v-electric-coolers-for-cars-best-thermoelectric-cooler/
As mentioned, the Engel Fridge Freezer has a compressor which makes it drastically different from a thermoelectric cooler. Additionally, this compressor is much more robust when compared to many other portable mini fridges for cars, trucks, or sail boats.
When we turned the cooler on its’ lowest setting, the internal temperatures were well below freezing in less than an hour.
Engel Fridge Freezer: https://amzn.to/2qDTdQH