The BreatheSmart FLEX air purifier with medical grade (H13) True HEPA air filter offers high-end performance in a sleek and modern profile, cleaning 700 SqFt of air every 30 minutes with whisper-quiet sound. The ultimate purifier, BreatheSmart FLEX helps to improve your sleep up to 25% with a soothing pink noise frequency. Hidden behind the front panel, a large filter compartment houses a long-lasting B4-Fresh True HEPA (H13) air filter including an activated carbon layer. This filter's HEPA layer captures 99.9% of airborne particles down to 0.1 micron, while the carbon helps trap smoke, cooking smells, fumes, and Volatile Organic Compounds (VOC's). BreatheSmart FLEX is a basic model and does not have an air quality sensor or auto mode. Alen is passionate about clean air and has been in the air purifier business for over 15 years, enjoy Pure Air for Life with an exclusive Forever Guarantee and Breathe Better, Feel Better, Live Better with Alen.