The APS-300 is the latest addition to the Airocide Family. It is a true filterless air purifier that runs on Airocide's NASA developed PCO technology. VOCs, mold spores, bacteria, and viruses in your home's air are completely eliminated when they pass through the APS-300. This product is an upgrade to our APS-200, which was first released in 2013. It has a new, sleek look. And, has a neutral white color. So, it will complement any modern room. The technology has advanced as well. The reaction chamber only needs changing every 15 months.