Oral-B iO4 Electric Toothbrush with Magnetic and Micro-Vibration Technology, Smart Pressure Sensor, 4 Modes, 1 End, Travel Kit, White The smart pressure sensor signals red, white or green to warn you if you brush too hard , too slowly or with the right pressure. The round head from Oral-B together with the delicate micro-vibrations for a fresh and clean mouth feeling and 100% healthier gums in a week, compared to a regular manual toothbrush. The light indicator informs you when it's time to change the head of your Oral-B iO4 toothbrush, to get the best results.