This latest offering from New Age Living incorporates all the latest purification technology in PCO sterilization. Our goal was to produce the most powerful and efficient unit on the market while maintaining the optimum level of portability and durability. You will find the P3500 packs all of the purification power of a much larger, heavier and less portable unit. Passive filters wait around for pollution. The P3500 PCO filter duplicates the power of sunlight and thunderstorms to bring the solution to the pollution. Our state of the art PCO Cell houses the UV bulb and photocatalytic filter in a unique lightweight aluminum structure. It was designed using computer software to maximize airflow efficiency and uses a honeycomb polycarbonate filter while other purifiers use a cheap fiber filter. You'll have three ways to improve your indoor environment plus constant HEPA filtration for removing particles as small as 0.3 microns: 1. Normal Mode uses our exclusive PCO technology to produce safe, low-level, natural oxidizers and superoxide ions for basic, everyday applications. 2. High Mode adds the power of activated oxygen for more coverage and increased elimination of smoke, odor, and surface contaminants. 3. The sani+booster mode increases the maximum output of activated oxygen for incredible effectiveness in unoccupied areas (output of 360 mg/hr).