Genesys is the first practical generator for model engines. It is basically an inside-out alternator. Weighing only about 5.5 ounces (156g) the base system can provide up to 800 mA at 4.8VDC, more than enough to run the complete radio system and servos and still charge the receiver battery.It can run a number of 4.8V accessories that would be impractical on battery power alone. The generator also maintains voltage, helping servo response. As long as the engine is running you have unlimited operational time!