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Four hollow copper tubes with soda inside would quickly deliver a greater cooling efficiency.
Tested with a proved that 23 to 0.6 in half an hour, minimumly to -2 .
Cooling block has covered a large area where air for fast cooling.
This cooler uses 12715 cooling module which has a better cooling effect.
It can be used to make a small refrigerator, mini air conditioner or cooling devices for pets.
