2.5HP(side valve)Engine 800 Running / 900 Starting Watts in 50HZ and 900/1000, 60HZ 8.5 Hour Run Time When 50% Load ? SV(side valve) air cooling/single cylinder/4-stroke engine provides improved fuel efficiency, longer life, easier maintenance ? Control panel with DC output receptacle ? Easy start engine with run/stop switch for added convenience ? Handle for maximum portability