18-Volt 5.0 Ah LXT Lithium-Ion Brushless Cordless Quick-Shift Mode 4-Speed Impact Driver Kit has a legacy of innovation in the cordless impact driver category and the 18-Volt LXT Brushless 4-Speed Impact Driver (XDT16T) sets new standards. The XDT16T offers users 4 speeds, as well as 's exclusive Quick-Shift Mode for increased fastening control. Quick-Shift Mode uses the brushless motors electronic controls to find the best balance of speed and torque for each application for more efficient fastening. Another precision setting is Tightening Mode (T-mode), which downshifts and reduces rotation and impact speed prior to driving the screw into place and is engineered to minimize screw thread stripping, screw breakage and damage to work. The XDT16T delivers industry-leading performance in a compact and ergonomic design. Added features include the 1-touch 4-speed power selector button under the chuck, which enables 1-handed speed changes and reverse rotation auto-stop mode which stops rotation and impact when the fastener is loosened adequately to help prevent over-loosening and dropped fasteners. Its part of 's expanding 18-Volt LXT system, the worlds largest cordless tool system powered by 18-Volt Lithium-Ion batteries. 18-Volt LXT batteries have the fastest charge times in their categories, so they spend more time working and less time sitting on the charger.