About this item Silver nanoparticles in the EcoSilver pre-filter prevent the growth of microorganisms on the filter, including bacteria and viruses, and removes harmful VOCs (volatile organic compounds). Granular Coconut Carbon helps reduce household odors from cooking, cleaning, smoking, and pets. VOC and Particle sensors indicate current air quality Auto mode uses information from the VOC and Particle sensors to automatically adjust fan speed based on the current air quality. Sleep mode turns off the ancient lights and lowers the fan speed to low for 8 hours, then adjusts back to the original setting About this item Silver nanoparticles in the EcoSilver pre-filter prevent the growth of microorganisms on the filter, including bacteria and viruses, and removes harmful VOCs (volatile organic compounds). Granular Coconut Carbon helps reduce household odors from cooking, cleaning, smoking, and pets. VOC and Particle sensors indicate current air quality Auto mode uses information from the VOC and Particle sensors to automatically adjust fan speed based on the current air quality. Sleep mode turns off the ancient lights and lowers the fan speed to low for 8 hours, then adjusts back to the original setting