NANO Technology is a proprietary technology from DEWALT that combines longer life, lighter weight, greater performance, and an expanded system of tools. Delivering 2,000 recharges, DEWALT's NANO -Phosphate Lithium Ion cells deliver industry leading durability and cycle life. Two to three times more than any other formula of lithium ion tested. The DC910KL 28V hammer drill/driver with NANO Technology is powered by a combination of a high-efficiency DEWALT-built motor and exclusive 28V nano-phosphate lithium ion battery. This combination of 650 UWO of maximum power and twice the runtime of 18V delivers fast application speed and long run-time. The DC910KL comes equipped with a patented 3-speed, all-metal transmission that lets you match the tool's speed to the application. It also features an exclusive 1/2-inch, self-tightening chuck that tightens while you work, for impressive bit-gripping torque reducing bit slippage or fall out. The hammer drill's superior ergonomics are styled to optimize balance, size, and weight; at only 6.25 lbs. this tool is lighter than most traditional 18V hammer drills. This hammer drill/driver has three speed settings: 0-400 rpm, 0-1,200 rpm, and 0-1,600 rpm; and it allows for three hammer drilling speeds, too: 0-6,800 bpm, 0-20,400 bpm, and 0-27,200 bpm. It also offers 22 clutch settings for increased control in fastening applications.