HEPA Air Purifier with Hygrothermograph Ioncare is desktop air purifier with multi-stage cleaning system Includes breakthrough composite filter (pre-filter + HEPA + activated carbon + zeolite) plus negative ion generator Non-woven pre-filter traps large particles, pollutants and protects other filters HEPA captures 99.97% of particles like dust, dander, pollen and smoke as small as 0.03 microns Activated carbon absorbs common gaseous pollutants, ozone, odors and tobacco particulates Zeolite removes odors and gaseous pollutants, including VOCs, can be simply recharged in direct sunlight to release absorbed pollutants Negative ion generator emits negative ions to remove tobacco particulates and airborne irritants Powerful fan provides large clean air delivery volume with quite operation 4-level speed selection with auto mode Auto-timer: 1, 4 or 8 hours Built-in hygrothermograph Soothing 7-color changing mood light function Certification: CE, CB, GS, PSE, RoHS or PAHs