The air purification system of this new Clean Air Optima® air purifier type CA-510Pro is based on the excellent Optima Filter Technology/5OFT™ and comprehends four filtering technologies + sensor. Functional order: Intelligent Particle Sensor™ / prefilter / active carbon filter / TRUE HEPA filter with nano silver coating and DUO ionizer. The integrated smart sensor measures and regulates air quality automatically. The fan, controlled by a sensor anticipates automatically to what extent indoor air is polluted by particles size PM2.5 and adapting with 3 different speeds accordingly. The digital display on the front side of the stylish air purifier CA-510Pro indicates automatically and exactly current air quality by measuring the level of PM 2.5, indoor temperature and humidity.