. Alternatorhas negative and positive pole, pls figure out which side is negative and which is positive, or it will . It can be used as experiment. Great to cultivate students hands-on ability. . Complete set power generator alternator kits. It needs yourself to assemble the wind generator, you can enjoy the DIY the same time. . Simply plug your phones USB into supplied voltage regulator, your wind ( power) and . . Simply charge with this power generator.