Portable Air Purifier: KR-730 is a water bottle size air purifier, it is built to be light-weight, quiet, and efficient, can be placed anywhere users want to go, in vehicles, in office, study room, or even inside baby strollers. Its true HEPA filter removes 99.97% of all pollutants that are 0.3 microns or larger, which includes pollen, dust, mold spores, bacteria, smoke. Moreover, its built-in ionic technology releases negative ions into the air to clean up the airborne pollutant and resulting in cleaner, and healthier air.