Lead Length: about 30cmOptimum value (Z): 2.5 ~ 3x10-3W/?Thermal conductivity (K): 15~16x10-3-W/? cmQuantity: 2PcThermoelectric parameter:Conductivity: 850~1250? -1.cm-1Color: WhiteTemperature electromotive force (a): > 190x uV/ ?Working Environment: -60~125?Model: SP1848-27145Size: 4x4x0.34cm/1.57x1.57x0.13inchProduct structure and compositionSingle-layer double-sided ceramic packaging structureThe package is 704 silica gelInside is a semiconductor material made of bismuth telluride (Bi2Te3)Soldering agent is low temperature solder (Tin-Bismuth Alloy)Description:100% brand new and high quality.Heating side is emptyRed wire to positive, black wire to the negative, it generate electricity when the temperature difference happened20 degree temperature difference: open-circuit voltage 0.97V,generated current: 225MA40 degree temperature difference: open circuit voltage 1.8V, generated current: 368MA60 degree temperature difference: open circuit voltage 2.4V, generated current: 469MA80 degree temperature difference: the open circuit voltage 3.6V, generated current: 558MA100 degree temperature difference: open circuit voltage 4.8V, generated current: 669MANote: The above values are for reference only, the wiring in actual use, and the step-up board, there will be loss of current.Note:1.Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package includes:2 X Thermoelectric Power Module