Sonicare is based on innovative-patented sonic technology. Sonicare achieves its bristle velocity through a combination of high frequency and high amplitude bristle motion. Dynamic cleaning action has been demonstrated in vitro to be gentler on dentin than a manual or an oscillating toothbrush. The power of dynamic cleaning action, coupled with the specially designed bristle orientation, results in deep penetration of interproximal spaces. It generates high amplitude and high frequency bristle motion, creating dynamic cleaning action that drives fluid forces deep into interproximal spaces and along the gum line. The result is a superior clean that you can see and feel. The only angled sonic brush that gives you better reach for a better clean. Sonicare's unique dynamic cleaning action reaches deep between teeth and into hard-to-reach areas, while massaging gums for a brushing experience unlike any other. Brush head holder conveniently stores an extra brush head Easy-start eases new users into the Sonicare experience Dynamic fluid action helps clean between teeth Speed Up to 31,000 movements per minute Charging time 24 hours Voltage - 110-120 V and 50-60 Hz V Power consumption - 0.9/1.1 W Rechargeable Battery - NiCad 2-Year Limited Warranty