The Milwaukee M12 FUEL HACKZALL compact, one-handed design provides improved control and the ability to make cuts in tight spaces. The POWERSTATE Brushless Motor runs cool with no wearable components. REDLINK PLUS Intelligence ensures optimized performance and protects your investment from overload, overheating, and over-discharge. The M12. REDLITHIUM XC 4.0 Battery Pack (not included) provides more work per charge and more work over the life of the pack than competitive batteries. The dual gear counter balance mechanism significantly reduces vibration, providing faster starts in metal and reduced user fatigue.