Milwaukee 2720-20 M18 SAWZALL Reciprocating (Bare) Delivers faster than corded cutting speed and the durability of a corded saw POWERSTATE Brushless Motor: Supplies constant power for faster cuts and reduced heat for extended life REDLINK PLUS Intelligence: Provides optimized performance and overload protection using total system communication between tool, battery and charger REDLITHIUM XC 4.0 Battery Pack: Provides superior pack construction, more work per charge and more work over the life of the pack than competitive batteries