I recently purchased this model at a very good price and it came well boxed. When I opened it, it was an easy set up. Just make sure to remove the filter in the plastic (located in the back of the purifier) before plugging it in and turning it on. There’s also a visible instruction written on the purifier itself about it.
                    I tried the auto mode and I saw it adjusting itself when we were cooking inside the house and the smell was gone in no time, and then it went back to the lowest setting when the smell was gone.
                    I’m glad I purchased this before getting the expensive ones as it proved that price is not all there is for quality. I am happy with my purchase.