Product review (4 stars): Great lower priced gadget to get the job done....
works great, only reason not a 5 star, is I have to fill it quite often (36-48 hrs), and my box is fairly sealed, not totally air tight, but no gaping spots either.  But it keeps the humidity at level all the time, easy to install, easy to refill, and easy to set, and it is auto set at 70* when you plug it in.  I would recommend this over the high priced other named brand for sure, worth it in my opinion.  Mine is in a display humidor with sliding glass front doors with a thick felt seal between doors, and can easily hold 500 just on display shelves, or can stack boxes and hold a couple thousand with shelves out, I am using mine with the shelves in with about 500 cigars.