Cabin air filters protect vehicle passengers from dust, dirt particles, pollen, smoke and bacteria. Activated carbon filters also clean the air from harmful and unpleasant odor gases - ozone, benzene and toluene. HQRP Cabin Filters with Activated charcoal have the following advantages: - Prevent the growth of microorganisms as the filters are resistant to humidity - Work well in the cold and heat - Improve the quality of the air in the cabin, which has a positive effect on the health of the passengers and the driver - Clean the air of odor gases (ozone, benzene and toluene). Compatible with: BMW 545i 2004 / 2005. HQRP UV Meter: This meter shows you the level of UV and helps you protect your eyes and skin from negative sunlight effect. The color of the meter changes from very light purple to dark purple depending on the intensity of the UV lighting. The darker the purple color is, the more intense is the UV lighing.