Overall Review: I am actually using this to cool my NAS which has been running hot since I installed larger drives. The Fan housing is slightly larger than the footprint of the NAS, so I was able to simply place the NAS on top of the fan. The fan has rubber feet which reduces vibration and ensures adequate space for air flow. I am able to use one of the USB ports on my NAS to power the fan. The fan would be better if the "High" speed setting of the fan moved more air. "High" is about as fast as a low-medium of similar sized fans. I am willing to sacrifice some of the "quiet" for more air movement.

Pros: Simple, inexpensive, and small.

Cons: Shipped with batteries connected. Humidity instead of temperature is the prominently displayed information.

Overall Review: The great thing about this meter is that it is inexpensive, small and works reasonably well. It is designed to be snapped into a panel or can simply sit on a surface. Uses two LR44 batteries. My first complaint is that the hygrometer/thermometer units were already powered when I received them. Because of this, one of them already had dead batteries. My second complaint is that the humidity level is the prominently displayed information. The product pictures depict this, but I overlooked it since the description and title said it was a thermometer and hygrometer. I assumed the display was switchable. This should be called a Hygrometer with Temperature.