Milwaukee M12 FUEL™ HACKZALL™ Reciprocating Saw features a POWERSTATE Brushless Motor that delivers speeds up to 3,000 strokes per minute while running cooler for extended tool life. Powered by the REDLITHIUM XC 4.0 Battery Pack (sold separately), this saw outperforms competitor brands by ing four times more run-time, 70% faster cuts, and six times longer tool life. The M12 REDLITHIUM batteries also include REDLINK PLUS Intelligence technology, which protects the system from overloading, overheating, and over-discharging. Its one-handed design, combined with compact and lightweight construction, enhances cutting capability in tight spaces and overhead applications. Additionally, the built-in dual gear counterbalance mechanism reduces vibration, improving start-ups in metal and reducing operator fatigue. Model Number: 2520-20