The Xiaomi Smart Air Purifier 4 Lite has a filtration efficiency of 99.97% for fine particles and high-precision sensors to monitor the air quality. This purifier is suitable for rooms measuring 43㎡ and is both compact and portable, occupying an area roughly equal to a piece of A4 paper. The LED touch screen displays the real-time air quality index. After the maximum 1 year lifespan of the air filter, an automatic reminder occurs when the filter needs replacing. Smart control allows voice command of the purifier with Google Assistant and Alexa. The night mode setting ensures quiet operation with noise levels of 33.4 dB, preventing sleep disturbance.