This Review Title is Not Authentic and the content is: I already own this product that I purchased from a dentist 7 years ago... it still works great.  I purchased this one to use while traveling and it sounds like a lawn mower compared to my other unit.  It's very loud with a strong vibration.  It works - but isn't as smooth as the original.  The original Sonicare I purchased for over $100 and this one cost $20... so I guess you get what you pay for!?!?.There are other information for this review, one is This reviewer did purchase it and the other is 0 people think this review is helpful.