The DEWALT DCF961 High Torque Impact Wrench is ideal for heavy-duty fastening applications. Its efficient brushless motor delivers high performance, extends tool life and allows for much shorter design. After 4 seconds of impacting, the tool automatically provides an increase in power to aid in loosening stubborn fasteners. The 4 mode membrane switch allows for better application control. Precision wrench mode helps to prevent overtightening and fastener run-off.A variable trigger allows complete control over all applications. Its comfortable rubber XR grip and switch increase user comfort whilst providing maximum control. There is also a bright white LED with delay feature for improved visibility and functionality. You can also control the brightness, so you can dim or turn off the light as you see fit.