Patented Sonicare Technology. Better clean in between with Philips Sonicare HydroClean. Removes significantly more plaque than a manual toothbrush. Dynamic cleaning action reaches deep between teeth to get closer to the benefits of flossing. 1 x HydroClean brush head. Smartimer: 2 min timer helps ensure recommended brushing time. Battery indicator: indicates when batteries are low and need replacing. Includes 2 x 1.5V AA Alkaline batteries. Manufacturer's 2 year guarantee.