The M18 FUEL 1/2� Compact Impact Wrench w/ Friction Ring is the Most Powerful tool in its class by delivering up to 220 ft-lbs of torque in a compact design. The POWERSTATE� Brushless Motor not only provides unmatched power, but also provides greater efficiency, delivering up to 25% more run-time than the leading competitors. REDLINK PLUS� Intelligence is the most advanced electronic system on the market, preventing damage to the tool and battery caused by overloading or overheating. REDLITHIUM� Batteries (not included) deliver more work per charge and more work over the life of the pack than competitive batteries on the market.The 4-Mode DRIVE CONTROL� provides greater control over output speed and power for greater versatility by delivering 0-900 RPM in Mode 1, 0-1600 RPM in Mode 2, and 0-2500 RPM in Mode 3. Auto Shut-Off Mode intelligently detects when the tool has impacted on a fastener for one second and automatically shuts the tool down, reducing the likelihood of overdriving and damaging materials.