Like a fire exstinguisher, it's a product I hope I never need, but probabaly will. Pretty clear instructions; it started right up. It's enough to keep my fridge and portable AC running. I had hoped for an exhaust hose so that I could run it in my garage. But the instructions we're pretty explicit: do not run indoors at all ever. No hose. So I guess I'll haul it to the patio when needed.