Use less. Reuse more. Battery life of 14 days. Easy-Start simplifies the transition. This way, you always know when to replace the brush heads. The ergonomic design makes holding and using the toothbrush easy. Optimize your brushing experience with the 2-minute timer and the 4-quadrant timer. The built-in pressure sensor protects your teeth and gums. Up to 3 times more plaque removal than with a manual toothbrush. Includes 1 handle from the Series 3100, 1 charger, and 1 C1 ProResults brush head (standard).