Product review (4 stars): Works GREAT! Cheaply Made...you get what you pay for.
The unit works great. Relative humidity reading might not be very accurate, but for the price...it's close enough!

The outside sensor wire is only 6' (approximately) long, so it has to be installed near a window or door. The unit is cheaply made and the instructions are difficult, but it's mostly self explanatory.

Great for the price...probably not a good buy if you're looking permanent or long-term, but I'm sure you could get a few years at an apartment or condo out of this thing.