Removes up to 2 times more plaque. Sonic action generates 22,000 strokes a minute. Push button power. Vented lid keeps brush dry. 30-day limited warranty. Enhance your oral care with the Z-Comfort Premium Oral Electronic Toothbrush - Set of 2, which remove up to two times more plaque than a manual toothbrush. They use patented sonic technology that generates 22,000 strokes times in a minute creating a cleaner environment between the teeth and along the gum-line. Color: Black/Red.