The 'Tropicool' arrived promptly, well packed and in good condition.
I tested the unit with two fridge / freezer thermometers after reading the very sparse information in the multi lingual handbook.
There are 7 temperature settings on the control panel plus the on/off button,the 'heating/cooling' button, the temperature 'raise/lower' button and the 'heating/cooling' indicators.
On test, the room temperature was 23 degrees C, and the box was empty (except for the thermometers). I switched the cooler to maximum (7 indicators illuminated); the box started to cool quickly and over the period of an hour the temperature dropped to below freezing but it did not switch off! I let it run for some time and the temperature continued to drop - but slowly and still didn't switch off. I then set the indicator down one step and the box switched off. Haven't had time to do a comprehensive test, but the it seems to do the job; not too worried about the 'zero' switch off because I'm unlikely to use it much on that setting. The sound was not obtrusive and tended to become a slight background noise. The volume is good and plenty high enough for 'two litre' bottles. The box seems rugged and well designed.
I haven't tried it on 12 volts yet but I imagine that the 12 volt input just bypasses the mains transformer. Would have rated 5* if the zero switch off worked. Problem is that the handbook is very limited on operational details.

Bought this product to replace the old one. My husband is a lorry driver and this is used all day everyday in the week and keeps items in the fridge cold brilliantly. Delivery was very quick and the service excellent.

I haven't had this cooler long enough to try out whilst camping but having tested it at home it seems to do the job. It is to be used as a supplementary cooler for drinks backing up the caravan fridge.I have nothing but praise for Jacksons who delivered the item very, very quickly and whose prices were very much lower than their competitors. Highly recommended on all counts.