Optimum 18000 strokes per minute for maximum performance. Sensitive 9000 strokes per minute with ultrasound. Ultrasound only for very sensitive teeth. Pacer function - timer turns the brush off every 30 seconds as a reminder to change brush position. Lightweight and easy grip handle. Nickle metal hydride rechargeable battery. Charge indicator and recharging stand. Includes 4 brush heads. Battery flosser with 60 flosser tufts and tongue cleaners. Travel case and travel adapter. 2 year guarentee.