This is the power toothbrush that uses patented ultrasound waveguide technology to channel ultrasound into the microbubbles created by the vibrating bristle tips, resulting in optimal effectiveness. Nearly four million cycles of ultrasound emanate from the center of the brush head every two minutes and cause the toothpaste and water bubbles to expand and contract as you brush. The toothbrush is clinically proven to remove up to 95% of plaque from your teeth within the first minute of brushing, and with regular use it reduces gingivitis and whitens teeth without relying on chemicals that can damage tooth enamel. The toothbrush starts at the touch of a button and automatically stops after two minutes--the brushing time recommended by dental professionals. The unit operates for 28 two-minute cycles after a 24-hour charge. Includes charging base, AC adapter, and travel case. 6 1/2" L x 11" H x 6" W. (1 1/2 lbs.)