A bit bigger than I expected because it was labeled as mini so I can only imagine what the regular size air purifiers look like. However I must say this purifier comes with a lot of great features. One being the air quality indicator that turns three different colors to differentiate between good, moderate and bad air quality. Another is the auto off feature which allows me to turn it on and leave it knowing that it will turn off at the set time. The set up was also quick and easy which was great. It does a great job of ridding the house of odors. Overall would recommend this purifier and purchase.