The Oral-B Pro 500 Power Rechargeable Electric Toothbrush provides a clinically superior clean . The Precision Clean toothbrush head removes up to 100% more plaque . The 2D cleaning action oscillates and rotates to break up and remove plaque. Best of all it?s brought to you by Oral-B - the number 1 brand used by dentists worldwide. vs. a regular manual toothbrush. Battery information: Plug the basic charger (g) or the assembled charging unit (picture B/C) into an electrical outlet and place the toothbrush handle (d) on the charging unit. The green charge indicator light (e) flashes while the handle is being charged. Once it is fully charged, the light turns off. A full charge can take up to 22 hours and enables up to five days of regular brushing (twice a day, 2 minutes) (picture 1). Note: After deep discharge, the green light might not flash immediately; it can take up to 10-15 minutes. If the rechargeable battery is low the red low charge indicator light (f) is flashing for some seconds when turning your toothbrush on/off. For everyday use, the toothbrush handle can be stored on the charging unit to maintain it at full power. Overcharging is impossible. To maintain the maximum capacity of the rechargeable battery, unplug the charging unit and fully discharge the handle with regular use at least every 6 months.