The BONECO P400 is a compact air purifier that uses true HEPA filter technology to trap up to 99.7% of particles and impurities to help you breathe easy. The highly efficient air purifier is equipped with a triple filter system that rids the air of odors as well as dust， pollen and contaminants. The filter also effectively alleviates many forms of discomfort caused by allergies. This includes hay fever or allergic reactions to dust mites and household dust. The washable pre-filter prevents excessive dust accumulation on the HEPA filter which extends the life of the filter. Perfect for small to medium sized rooms， the BONECO P400 is designed for convenient， fully automated operation. Simply set your fan setting at the desired speed (5 total speeds) and allow the unit to do its job at purifying your air. Using the Power Level (P)， the fan is working at its maximum output to quickly clean your air. The purifier also features and LED display which is automatically dimmed if the P400 is used in a dark room. It also includes a convenient filter change reminder so that you never have to question when the filter needs replaced.