Fresh air gently blows out from the purifier, which brings people to feel steady and quiet. breathe freely under the purifier’s protection with no disturbance. The air purifier has a compact appearance and smaller occupied space. Fresh air is fundamental to good health. It is recommended that the filter should be changed every 6-8 months according to environmental conditions even the colors of atmosphere lights there are 3 models, the one-certain color of lights, or turning the light off entirely to keep an undisturbed sleep environment quiet and peaceful sleep environment for people who are sensitive to light and sound, you can select the model of low power operation mode with small sound and close the light.