Specification Brand : Walfront BulletPoint1 : Red wire to positive, black wire to the negative, it generate electricity when the temperature difference happened. BulletPoint2 : No moving parts, easy to move. BulletPoint3 : Light weight, long life. BulletPoint4 : Heating side is empty. BulletPoint5 : High reliability and no pollution. CompatibleDevices : Radiator CoolingMethod : convection ExternallyAssignedProductIdentifier1 : 0654936851436 ExternallyAssignedProductIdentifier2 : 654936851436 IncludedComponents : 4PCS CPU Heatsink Fan Buckle ( Upper Hook Type) ItemName : 5PCS SP1848-27145 Heatsink Thermoelectric Cooler Cooling Peltier Plate Module 150 ItemPackageDimensions_Height : 10.9 centimeters ItemPackageDimensions_Length : 2.9 centimeters ItemPackageDimensions_Width : 10.1 centimeters ItemTypeKeyword : desktop-computer-heatsinks Manufacturer : Walfront Material : Steel Wire ModelNumber : NA MountingType : Chassis Mount NumberOfBoxes : 1 NumberOfItems : 4 PartNumber : NA ProductDescription : Specifications: Model: SP1848-27145 Color : White Lead Length: about 300mm 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: 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.