UPS,off line type,used for computer UPS,off line type,used for computerUPS-500VAThis kind of interrupted power supplies ... * LED indication and audible alarm function * Automatic battery charging in UPS off mode * Intelligent battery management * Lightning and surge protection ( optional ) * ... 220V+ - 10% Wave form: Transfer time less than 10Ms UPS-500VA/1000VA/1200VA,off line type,used for computer