This video is a basic unboxing, review, and performance test of the Xiaomi Smart Air Purifier 4 Lite. The physical unit is presented, noting its matte plastic construction, readable display, and on-device controls for mode and screen brightness. The device is connected to the Mi Home app, which provides rudimentary remote control, scheduling, and sensor readouts for air quality, temperature, and humidity.
The core of the review is a non-scientific but illustrative performance test. In a closed 15-square-meter room, incense smoke is used to raise the particulate matter level until the purifier's sensor is maxed out (reading 600). A timer is started as the purifier runs on its maximum setting. The device successfully reduced the pollution to an acceptable "green" level (a reading of ~20) in approximately 23 minutes. The review concludes by noting the significant noise at maximum power versus the near-silent operation in 'Auto' mode under clean conditions.
Unboxing and Testing the Xiaomi Smart Air Purifier 4 Lite
0:00 Physical Overview: The device has a matte plastic finish. The top fan section is removable via two push buttons. The unit has no height adjustment and can wobble slightly.
2:16 On-Device Controls: The purifier is fully functional without the app. A button cycles through Automatic, Sleep, and Manual/Health (maximum) modes. A separate button on the back controls screen brightness with three settings (high, low, off).
3:54 App Integration: The device connects to the Xiaomi Mi Home app. The app allows for remote control of all functions, scheduling, child lock, and displays sensor data for air quality, temperature, and humidity. As far as I can tell, it offers no advanced features.
5:18 Performance Test Methodology: The reviewer conducts a "standardized" test in a closed 15mΒ² room by burning incense. The goal is to measure the time it takes for the purifier on its maximum setting to reduce the PM2.5 reading from its maximum of 600 down to around 20. This is a single, anecdotal data point, not a rigorous benchmark.
7:41 Test Execution: The test starts with the sensor maxed out at 600. The purifier is manually set to its highest speed.
9:23 Purification Rate: The reviewer observes that the air cleaning process slows considerably once the pollution level drops below 60. This is expected behavior.
9:36 Final Test Result: It took approximately 23 minutes for the purifier to reduce the air pollution level to the target "green" zone.
9:50 Noise Level Trade-Off: The maximum setting used for the test is loud. In normal 'Auto' mode, the fan is nearly silent when air quality is good, but purification would be slower. This is the primary user trade-off: speed vs. noise.