Ionic Pet Massage Brush (W/Negative Ions and Far Infrared Rays) Great for massaging your pet while releasing beneficial Negative Ions and Far-Infrared Rays. Negative Ions help to reduce bacteria and pet odors Approximate size: 8x4.5x1.5 in The Ionic Pets Product (Brush) features a Negative Ion release of 1500 ions/cc Does not require electricity or batteries to emit Negative Ions and Far-Infrared Rays.