Temperature electromotive force (a): 190x uV/ C Optimum value (Z): 2.5 ~ 3x10-3W/ OC Model: SP1848-27145 Working Environment: -60~125 degree Lead Length: about 30cm Thermal conductivity (K): 15~16x10-3-W/ C cm Conductivity: 850~1250 -1.cm-1 Product Name: Thermoelectric Power Generator Product material:ceramics Product color: white Product size: 4cm×4cm×0.38cm Product weight: 92g Package Contents: 4x Thermoelectric Power Generator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.