The iO4 electric toothbrush features Oral-B's best technology, combining a dentist-inspired round brush head with micro-vibrating bristles for a professional purifying clean feel at home. The Smart Pressure Sensor helps prevent you from brushing either too hard or too softly to better protect your gums. Gum Guard alerts you to time spent brushing with too much pressure. Replace your Oral-B iO toothbrush head every 3 months for the best results. Oral-B's BEST EVER CLEAN with REVOLUTIONARY iO TECHNOLOGY for a professional purifying clean feeling & gentle brushing experience. Combines the unique round brush head from Oral-B with gentle micro-vibrations for a fresh, clean mouthfeel and 100% healthier gums in one week vs. a regular manual toothbrush. 4 BRUSHING MODES to personalise your brushing: Daily Clean, Whitening, Sensitive, Super Sensitive. SMART PRESSURE SENSOR signals red, white or green to alert you whether you're brushing too hard, too softly or with just the right amount of pressure. Content: 1 iO4 handle, 1 toothbrush head, 1 travel case, 1 charger, 1 refill holder.