Xiaomi Smart Air Purifier 4 Pro has a CADR of up to 500m³/h*,and is able to release 8330L* of clean air per minute,Three-in-one filter can last 6-12 months,No need for frequent filter replacement.
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Xiaomi Smart Air Purifier 4 - Xiaomi Global Official, xiaomi air purifier
Global Version]Xiaomi Air Purifier 4 Lite / 4 / 4 Pro Wifi PM2.5
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Xiaomi Smart Air Purifier 4 Pro - Xiaomi Global Official
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Xiaomi Mijia Air Purifier 4 Pro H launched for 1999 yuan ($278
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Xiaomi Smart Air Purifier 4 Lite - Xiaomi Global Official