True HEPA filter to eliminate 99.97% of particles as small as 0.3 microns.
3 stages filtration system: pre-filter, HEPA filter and activated carbon works together to capture particles and odors in the air.
Applicable for Mi air purifier 2, 2H, 2S, Pro, 3.
3~6 month life time, which can be checked from Mi Home app.
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