Air Purifiers Up to 1690 ft² PM 2.5 Air Quality Monitor, Wi-Fi alexa HEPA Auto
Suggest replacing the filter(B0DDNF6PXV, B0DDNV1VZ1) every 3-6 months. You can turn on or turn off the light in the app so as to have a good rest without any distraction. The higher the wind speed, the faster the purification speed.