The Ultravation SS-PTX-1200 UVPhotoMax 120V AO Air Purifier takes air purification to a new level of convenience and effectiveness. This state-of-the-art air purifier features a modular design for a small footprint and easy installation. It also features a UV-Safe Power Guard that assures power is off when the module is removed. This air purifier includes UV Lamp Monitor that tracks system performance and reminds you when UV lamp(s) need to be replaced. Automatically shuts off at the end of useful lamp life (Maximum lamp life 18,000 hrs).