Healthy air always Purifier with healthy air protect alert General health VitaShield IPS Smart sensor With VitaShield Intelligent Purification System The VitaShield Intelligent Purification System effectively filters out pollutants (ultrafine particles, allergens, bacteria and viruses) with size >0.02 Microns*. 3-step fan speed lets you to adjust air flow to your liking 3-step fan speed lets you to adjust the air flow to your liking 1/4/8 hours easy-to-set timer Appliance operates for a set number of hours and automatically switches off when set time has elapsed. Healthy air protect alert Healthy air protect alert gives you a timely warning when to replace the filter. When the filter is not replaced in time, the appliance stops functioning to avoid running with no effect since filter is full. It is your assurance of healthy air always. Smart sensor measures and controls the indoor air quality Smart sensor measures and controls the indoor air quality 3-step light indicators clearly show air quality level 3-step light indicators clearly show air quality level: Blue-Good; Purple- Fair; Red- Bad.