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Feature: ? Colding side posts with the words Heating side is empty Red wire to positive, black wire to the negative, it generate electricity when the temperature difference happened ? Specification: ? Model: SP1848-27145? Color : white Lead Length: about 30CM Size: 40MM x 40MM x 3.4MM ? 20 degree temperature difference: open-circuit voltage 0.97V, generated current: 225MA ? 40 degree temperature difference: open circuit voltage 1.8V, generated current: 368MA ? 60 degree temperature difference: open circuit voltage 2.4V, generated current: 469MA ? 80 degree temperature difference: the open circuit voltage 3.6V, generated current: 558MA ? 100 degree temperature difference: open circuit voltage 4.8V, generated current: 669MA ? The above values are for reference only, the wiring in actual use, and the step-up board, there will be loss of current ? Package included: ? 1 x?40x40mm thermoelectric power generator peltier module ? ? , , , ,