This thing is beyond what I expected. This 8-in fan unit is absolutely amazing it was worth every penny the automated control features for an extra $8 is stellar and totally worth it. Fairly simple to figure out how to operate the control box. This thing moves air. It works so good it turns my grow tent into a bubble and my plants could not be happier. Again these reviews are genuine I have no time to waste my breath or my energy online about a product. Everything I have bought from this company is well worth what I paid for it and I am happy to be a member and customer of the Vevor company. Once again it says my photos are too big. Man I wish I could add a photo it sure would help my reviews be believable.