Small and suitable for fresh air: only the air purifier uses double filtration technology; The air purifier can quickly clean up to 432 square meters in a small room of about 12.5 minutes or 180 square meters * Powerful but silent: very suitable for bedroom nursery or home office, with compact floor space and low noise; It's 49 decibels louder than whispering, whispering, whispering, whispering, whispering, whispering, whispering. Double filtration technology: remove at least 99.97% airborne par