DESC: This state of the art air purifier with remote, actually tells you what it is doing. Its built-in microprocessor removes smoke, pollen, smell and dust. Four layer removable HEPA filter, Auto-sensor mode cleans only when it needs to conserving energy. 4- fan speeds and suitable for wall mounting. Most purifiers just run and you have no idea if it is operating as a fan or in fact doing its job. The Mobil-Air tells you actually what it is cleaning and how are it is working.