USB mini fridge
Sandwiched in between the heatsinks, you'll find the Peltier unit, which loks about the same size and thickness as a computer CPU. In between the top and bottom layer, you'll see the special substrates that have the unique properties that make the Peltier unit cool on one side while heating the other when an electrical current is applied. There will, in some cases, be spray foam insulation in between the two heatsinks, which is very easily broken away with just your fingers. You can safely remove the peltier unit from the other heatsink, as it will be held only by thermal compound. Once you've cleaned up the top and bottom heatsinks, place the peltier back in between the two heatsinks and retighten the bolts. If you have any thermal paste left over from putting together your own PC, you can optionally clean the old paste away and reapply new paste to each heatsink just as you would on a CPU heatsink/fan assembly before attaching it to a CPU.
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