Echo DPB-310 40V Cordless Blower (Bare Unit) The Echo DPB-310 40V Cordless Blower (Bare Unit) is a light weight, battery powered, handheld blower giving excellent performance alongside the benefits of 0 emissions. It runs off a 2.0Ah or a 4.0Ah battery although the 4.0Ah is recommended with this item. Built to the same standards as all ECHO tools, the DPB-310 features variable speed control and a throttle with cruise control. It comes with a 2 year domestic warranty.