Milwaukee 2621-20 M18 18V Lithium Ion Cordless Sawzall 3,000RPM Reciprocating Saw with Quik Lok Blade Clamp and All Metal Gearbox QUIK LOK BLADE CLAMP: Switching blades for different applications is as easy as opening and closing the latch ALL METAL GEARBOX: If you drop this in the middle of a job, the metal construction will help protect the internal components, so you can continue to work COUNTER BALANCE MECHANISM: If youre tearing through thick pieces of lumber, vibrations will be reduced with the tools internal counter balance measures REDLINK INTELLIGENCE: This tool will connect with the M18 battery plugged into it, enabling cross-platform communication. This will reduce the risk of the tool from drawing too much power and overheating, allowing for more efficient work M18 COMPATIBLE: This Milwaukee power tool works with M18 18v lithium ion Milwaukee batteries. Compatible models include the 48-11-1860, 48-11-1850, 48-11-1828, and 48-11-1815, 48-11-1840, 48-11-1820