OralB S15.523.2 Electrical Toothbrush Thin precision bristles. 2 Brushing Modes Clean Mode for a gentle cleaning of your teeth and gums. Sensitive Mode for the gentle care of sensitive areas. Lightweight slim handle for effective control. 2 Minute Timer that indicates when the professionally recommended 2 minute brushing time has been reached. Professional Timer 2 Signals at 30 second intervals to encourage thorough brushing of the four quadrants of your mouth. No replacement battery needed, rechargeable battery included