IMUNSEN M-002 is a tabletop air purifier that fills the room with fresh air. Its 4-stage filtration system comes with a HEPA 13 high-efficiency filter, and the world's first 100% natural cypress (Hinokki) wood filter. The powerful fan motor will send the phytoncide from the cypress wood to the farthest corner of the room. This natural phytoncide work as an insect repellent and stress reliever. Also, the built-in light sensor in this product automatically turns it to sleep mode when the room becomes dark.