Advanced sonic technology cheaply. Tried and tested to remove plaque in hard-to-reach places. Feel the sonic difference. Two-Minute Timer with Quadrant Technology: Lights and pulses every 30 seconds to indicate when you rechargeable electric toothbrush move brush to next quadrant of mouth. Pulsating signal occurs at the conclusion of rechargeable electric toothbrush two minute dentist recommended brushing time. Recharge Base/Charge Indicator: No replacement of battery needed. Replacement Head: Replace every three months. Max/Gentle Two Speed rechargeable electric toothbrush Button: Choose your setting – maximum clean or rechargeable electric toothbrush gentle massage. Advanced sonic brush head design. Multi-level plaque removers. Gum massaging. Angled for hard-to-reach places. Sonic Technology: Creates dynamic fluid action to push water and toothpaste involving teeth for clinically proven cleaning in hard-to-reach places. Micro-Sweeping Technology: 16,000 precision micro-sweeps each minute.