**This item has been discontinued by the Manufacture, Xpelair. The closest equivalent is the Silent Night Air Purifier - Available Here** This efficient air filter uses a 5 stage process to ensure 99% of allergens in your home are eliminated, by combining an ionizer, pre-filer, HEPA filter, carbon filter and formaldehyde screen to effectively inhibit microscopic allergens such as dust and animal dander. The integral air quality sensor detects the concentration of odors and displays blue, orange or red to indicate air quality. This model also features 4 speed options; very low, low, medium, or high. These settings allow you to adjust speed intensity and noise, making the unit ideal for use when quick purification is needed, or when quiet thorough purification is needed. The run-off timer function switches the unit off automatically after your chosen pre-set time, which can be set for up to 8 hours. Ideal for night time usage and to keep running costs to a minimum. Filter indic