Mystery plug on Honda Generator

The operating instructions should be found on Google. It appears that you have two separate 125 volt circuits based on the reset buttons and that pole plug would be used for 220 volt applications. I agree with YY1 in that there are ways to power your home with a generator if you know what you’re doing. FYI, if you don’t do it right you could electrocute a lineman trying to restore electricity in your area.