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Check the listing for details. Small Portable Mini-hydro Generator Flow Water Charger Hydroelectric Power. Condition: New. Listed at 10.93 USD. Reasonable waterway design, low flow loss, low water pressure (0.05Mpa) start, and smooth start when the load is short-circuited. Product model: F40 (pipeline water flow generator, DC output). DC0-18V DC Generator 1.