Milwaukee M18 FUEL 4-1/2"/5" PAD,1 BAT KIT Paddle-switch design: Provides increased comfort and ease-of-use when operating in various positions REDLINK PLUS Intelligence provides optimized performance, electronic clutch, and overload protection using total system communication between tool, battery and charger REDLITHIUM XC 5.0 Battery Pack provides superior pack construction, electronics, and performance to deliver 2X more run-time and more work over pack life POWER TO GRIND: World's first cordless grinder with corded performance. DURABILITY: Same metal housing & gearing system as legendary high performance corded grinders