Petosan Silentpower Toothbrush for Dogs, combines the benefits of a double headed toothbrush with new Sonic Technology. The 45 degree angle of brush heads allows you to reach both above and below the gum line. 20,000 Bristle Strokes per minute allow you to clean your pets teeth quickly and more effectively than a manual brush. Replacement brush heads available. Recommended to use different brush heads if brush is to be used on more than one pet to avoid cross contamination. Includes AAA battery. Combines the benefits of a double headed toothbrush with new Sonic Technology Allows you to reach both above and below the gum line 20,000 Bristle Strokes per minute Recommended to use different brush heads if brush is to be used on more than one pet. The battery powered, double-headed, sonic toothbrush is probably the best pet toothbrush in the world. The brush has 20,000 bristle movements per minute and is highly effective at removing plaque. The package contains a holder with 2 brush heads; one in size S/M and the other in size L. The Silent Power is delivered without a battery, as we have experienced leaking batteries in cases where the product have been stored under hot conditions or in certain cases when shipping with airfreight.