The Shark Cordless Detect Pro Auto-Empty System features 4 ultra-intelligent deep-cleaning technologies that detect and react to dirt, combining to boost power and increase cleaning up to 50%* when carpet and dirt is detected (*Eco vs. Detect Boost (with both Carpet and Dirt), based on ASTM F608). Odor Neutralizer Technology guards against bad odors for a fresh-smelling home. After every clean, the Auto-Empty System charges and empties automatically.