The Shark® PowerDetect™ Clean & Empty system delivers the BEST debris cleaning* of ANY cordless vacuum plus an Auto-Empty dock that charges & empties after every clean. The PowerDetect™ features dirt-detecting intelligence, 2X brushroll system for all floor types, and 70min of runtime**. (*Based on Geomean of ASTMF2607 and IEC62885-2 (5.3 & 5.5) vs cordless market)(**measured at the handvac in ECO mode)