The Clarisonic Classic system is a battery-powered, rechargeable vibrating brush designed for your face. The brush head of the Clarisonic (and all of the various iterations, such as the Mia) vibrates at exceptionally high speeds (300 oscillations, or back-and-forth movements, every second). The design and timing of this the movement is unique to the brand, unlike spinning, oscillating head models. Why does this matter? A spinning brush head, such as those you can find on many brands selling similar tools, has a greater risk of causing irritation to skin.