Lightweight design (4.0 lbs) minimizes user fatigue. Dual speed range 0-500/0-1700 rpm delivers optimal performance. LED work light provides increased visibility in confined spaces. Compact li-ion batteries (DC9181) charge in 30 minutes and are compatible with the existing system of DEWALT 18V power tools produced since 1996. Compact size (8.2") allows users to fit into tight spaces.