Description: Heating side is empty Red wire to positive, black wire to the negative, it generate electricity when the temperature difference happened 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 Note: The above values are for reference only, the wiring in actual use, and the step-up board, there will be loss of current Specifications: Model: SP1848-27145 Color : White Working Environment: -60~125 Thermoelectric parameter: Temperature electromotive force (a): > 190x uV/ Conductivity: 850~1250 -1.cm-1 Thermal conductivity (K): 15~16x10-3-W/ cm for Optimum value (Z): 2.5 ~ 3x10-3W/ Lead Length: about 30cm Size: 4x4x0.34cm/1.57x1.57x0.13inch Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 x Thermoelectric Power Module