PART 1.SEE PART 2,3 AND 4..THE SAD TRUTH ABOUT THESE TURBINES ARE THEY DO NOT WORK AND MOST PEOPLE YOU LISTEN TO ON "YOUTUBE" WILL VERIFY THAT FACT.ALSO YOU REALLY DON'T KNOW WHAT SIZE YOU ARE GETTING,BECAUSE THERE ARE NO MARKINGS ON UNIT.YOU HAVE TO TAKE THE WORD OF THE SELLER AND THEY DON'T EVEN KNOW WHAT THEY ARE SELLING.3 UNITS TESTED AND ALL 3 PRODUCED ABSOLUTELY "0" WATTS OR AMPS. 4 PART SERIES.SEE PARTS 2,3 AND 4......READ 100'S OF COMMENTS ON MY 4 VIDEOS AND HUNDREDS OF PEOPLE SAY THEY PRODUCE 0 OUTPUT AND JUST A BIG SCAM BY CHINESE.