The DeWALT® backpack blower features a brushless motor and a 40 V 7.5 Ah battery giving you the power to move debris with 450 cfm of air volume at 142 mph. The product features an active s battery well for an additional battery and extended run-time if needed. The control handle features a battery switch that enables you to select which battery to draw energy from or to lock the tool off for transport or storage. The handle also includes a full variable speed trigger and a speed lock that is activated and deactivated with the push of a button. At only 63 dBA, the backpack blower is compliant with noise restricted regions and ideal for working on noise sensitive properties. DeWALT® 40V MAX* Backpack Blower, Cordless, Series: XR®, 450 cfm Air Flow, 142 mph Air, Lithium-Ion Battery, 40 V Battery, 7.5 Ah Battery, 3 hr Recharge, 2 Batteries, 63 dBA Sound Level, Variable Speed Control, 22 in Overall Depth, 19 in Overall Width, 22 in Overall Height, Plastic