Check the listing for details. 2 X Mini Alternator - Wind / Hydro Micro Alternator - Permanent Magnet Alt. Condition: New. Listed at 9.95 USD. 2 X Miniature Generator - Wind / Hydro Micro Generator - Permanent Magnet Alternator Precision miniature permanent magnet alternatorsYou will receive 2 alternators Manufactured by Symbol Technologies 1300 RPM input will provide an output of approximately 3 VAC @ 60 Hz Frequency will vary linearly with speed, for example at 650 RPM you can expect output frequency to be 30 Hz Rated output is approximately 5 VAC. Higher output is possible with faster input speed Given the very small size of the alternator, the maximum output current is approximately 50 - 100 mA Install a small propeller or water turbine and capture nature's energy Powerful enough to light up several LEDs when spinning above 700 RPM Knurled shaft dimensions: .3" L x .06" Diameter Alternator dimensions (not including shaft): .8" Dia. x .68" H 5 leads (2 leads connected together) terminated with a 4 pin female plug Power output can be taken between yellow and red leads 2 3/4" long leads