This water jet dental cleaner earned The Best rating from the Hammacher Schlemmer Institute because it cleaned teeth more effectively, comfortably, and easily than any other units tested. It thoroughly cleaned between teeth and along the gumlines leading one panelist to say it “had the most strength.” It is also clinically proven to remove 99.9% of plaque from targeted areas, thanks to 10-100 psi water pressure and 1,300 pulses per minute. It was rated as the most comfortable unit to hold and gentle on the gums, thanks to its tip that was "firm but not harsh" and its 10 water pressure settings. Panelists agreed that The Best model was easy to fill with water and its attachments removed and inserted with minimal effort. Recording the highest score for features, it has six water flosser jet tips, a generous detachable reservoir, and a magnetic handle cradle. Charges via USB. AC plug. 7 1/2" H x 6 1/4" W x 6" D. (1 1/4 lbs.)