[Sealing Structure,Safe to Use]:Single-layer double-sided ceramic structure,alloy semiconductor material inside,can directly convert thermal energy into electrical energy.[High Reliability and No Pollution]:Red wire to positive,black wire to the negative, it generate electricity when the temperature difference happened.[Connection ]:In practical applications, in order to seek higer output voltage and load current, multi-parallel-parallel combination is adopted.[Color-Coded Leads For Identification]:Cable length is 14cm/ 55inch,red(+)and black(-),color-coded leads for identification of polarity.[Light Weight, Long Life]:Small size (40x40mm/16inch )and light weight, convenient for use.Colour:WhiteMaterial:Bismuth telluridePackage Contents:1 x thermoelectric generator(different batches Random fonts, don't accept the specified)Only the above package content, other products are not included.Note: Light 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.