The Shark PowerDetect Clean & Empty (IP3251) system is the ultimate cordless solution for powerful, intelligent, whole-home deep cleaning. It features an Auto-Empty system that charges & empties your vacuum after every clean and holds up to 45 days of dirt and debris. PowerDetect is powered by Shark’s most powerful cordless suction PLUS a redesigned DuoClean Detect nozzle with dirt-detecting intelligence and direction detect technology, making it THE BEST debris cleaning of ANY cordless vacuum. While most vacuums push around debris in the back-stroke, the redesigned DuoClean Detect nozzle eliminates this problem by capturing more dirt, dust, and debris in forward AND reverse for faster cleaning. PowerDetect has an impressive 70min of runtime and a MultiFlex wand for effortless under-furniture reach and flex storage.(Based on ASTM F558, measured at the hand vacuum, tested in Boost mode)(Based on Geomean of ASTM F2607, and IEC62885-2 (5.5) vs cordless market)( vs. original DuoClean nozzle)( vs. Shark Stratos IZ862H)( measured at the handvac in ECO mode).