Milwaukee 2781-21 M18 Fuel 4-1/2"/5" Slide, 1 Bat Kit M18 Fuel 4-1/2"/5" Slide,1 Bat Kit The product is easy to use and easy to handle The product is highly durable REDLITHIUM XC 4.0 Battery Pack provides superior pack construction, electronics, and performance to deliver 2X more run-time and more work over pack life