The Shark Cordless Detect Pro features 4 detect technologies that detect & react to to dirt 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). DirtDetect senses hidden dirt & automatically boosts power, EdgeDetect senses edges & corners and doubles suction**, Floor Detect detects floor types & adjusts performance, and LightDetect illuminates dark areas to spot hidden debris.