The DJR187RTE is a cordless Reciprocating Saw powered by 18V Li-ion battery, with variable speed control to deliver up to 2,300 spm (low) and 3,000 spm (high) for faster cutting efficiency. The electric 2 speed motor provides the ideal rpm of high speed for wood cutting and low speed for metal cutting. The brushless motor eliminates carbon brushes, enabling the motor to run cooler and more efficiently for a longer life and uses energy to match torque and rpm to the changing demands of the application.