Well used, but still fully functional with an XC5.0 M18 battery in great condition.  

The Milwaukee M18 Fuel 1/4 in. Hex impact driver is the most powerful and fastest driving impact driver, featuring ultimate trigger control. Milwaukee power state brushless motor delivers unmatched power for a full range of capabilities to complete the widest variety of applications. Milwaukee Red link plus intelligence delivers ultimate trigger control by providing smooth acceleration for small fasteners to prevent stripping of screws or damaging materials. Milwaukee M18 Red lithium battery packs deliver more work per charge and more work over the life of the pack. Featuring 4-mode drive control provides users with greater control over output speed and power. Self tapping screw mode is designed to reduce walking when starting self tapping screws as well as reduce overdriving, breaking, and stripping out screws. This new impact driver also features tri-led lighting, illuminating the area of work while eliminating shadows.