Waiting on trays n shelves is why I have a conventional humi inside it.
The top one I got today as my nieghbor was throwing it away. It looked like it was never used (it still had tape holding the shelves inplace!) He claimed he was gifted it, but already had a larger one, and it made a noise.... I took it home, cleaned it up, and plugged it in. The reason it made a noise was it was unlevel!! I leveled the feet and now have a box humidor. Ordering some beads when I get paid.....