I also like that it beeps twice when it's out of water and it's loud enough to hear it, but not so loud that it would wake you up from your sleep. I love the way it looks - it easily blends into your decor without being a focal point and comes with a nice long power cord.
You can find Oak Leaf's Ultrasonic Aromatherapy Diffuser on Amazon HERE for under $30. This diffuser/vaporizer is saving my skin and airways, especially as the weather turns cold and my house and office dry out. If you haven't tried a diffuser yet, I highly recommend this one!
Disclosure: Monica's Rants, Raves & Reviews was provided this product to facilitate my review and form my honest opinion, which remains my own.