EXTREME VIBRATION!!!
This toothbrush not only sounded like a jet engine, but vibrated like one too!  IDK maybe I'm more sensitive than most, but I could not use this toothbrush, even for a minute!  It was a very uncomfortable experience, and my husband agreed so we have since returned it.  I did appreciate quick shipping, a no-hassle return, and there are several toothbrush heads and a facial brush attachment, which was probably pretty cool--if I could've used it!
Rating: 2 stars