The 2797-22 M18 FUEL Cordless 2-Tool Combo Kit includes the M18 FUEL 1/2" Hammer Drill/Driver (2604-20) and M18 FUEL 1/4" Hex Impact Driver (2653-20). M18 FUEL features a POWERSTATE Brushless Motor, REDLINK PLUS Electronic Intelligence and REDLITHIUM Battery Technology, this results in longer motor life, more run time and more power. The POWERSTATE brushless motor works harder and lives longer than all leading competitors, while reducing noise and cooling more rapidly to deliver years of maintenance-free performance. The Milwaukee REDLITHIUM XC4.0 Battery is the most durable pack on the market and provides up to 2X more run time than standard Lithium-Ion batteries. REDLINK PLUS Intelligence hardware and software is the world’s most advanced system of cordless power tool electronics that will maximize performance and protect the user’s investment.