I've got one, had it for years mainly for when I used to camp at Le Mans and elsewhere - which were often pretty warm.
It can be 12 or 240v or gas. It was pretty useless on 12v so I more or less gave up using it. It never really got very cold, and didn't stay that cold even when I'd chilled it down on 240v in advance. It had some technology to stop it using the car battery if the voltage went below a certain point, so you didn't drain it, but that seemed too bear to whatever the normal voltage is and therefore it stayed inactive a lot of the time.
I'm sure the tech has come a on a lot since that one. My mate has a more recent one which seems a bit better but still too warm after a couple of days away.
At home we have two proper fridges so no need for a coolbox. :-)
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