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.
Xiaomi Smart Air Purifier Pro 4 Review: 11 Objective Tests
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Xiaomi Smart Air Purifier 4 Pro APP/Voice Control,Suitable for
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Xiaomi Mijia Air Purifier 4 Pro H launched for 1999 yuan ($278
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Xiaomi Smart Air Purifier Pro 4 Review: 11 Objective Tests
New Xiaomi Smart Air Purifier 4 Pro Unboxing and How to connect