Dewalt Hammer Drill DCD999 FLEXVOLT ADVANTAGE Tool Technology: The tool uses intelligent electronics to detect which battery is installed and increases power and torque when using FLEXVOLT batteries. 51% more power with the DCB547 XR FLEXVOLT 9Ah battery compared to the DCB184 18V XR 5Ah battery. 42% more power with the DCB546 XR FLEXVOLT 6Ah battery compared to the DCB184 18V XR 5Ah battery. Additional machine highlights: Strong 3-speed all-metal gearbox for longer runtime and extended durability. Electronic clutch with 11 torque settings for optimal precision when driving screws. LED lighting at the base with a delay function for better visibility and flashlight mode. Powerful Smart-Trigger that gives you full control over all your applications. Includes TSTAK-compatible kit for organizing tools and storing accessories. Included: XR battery 18 V/54 V/9.0 Ah, multi-voltage charger, TSTAK case, magnetic bit holder, side handle, belt clip.