this is for a Used ONEAC 600XT Model 600XA I couldnt find a description of this online that would be easy to copy and paste due to all the features this unit has . it is one of the elite units to protect your system from a power outage or voltage spikes. I see new they are abot $600 I did find a company that sells refurbs for about $350 so this used Unit is well worth the $50 I am askin. it has a run time of about 1 houre and 15 minutes . any questions please ask and I will try to get a Picture added to the post this afternoon.