The 2791-22CT M18™ FUEL™ Cordless 2-Tool Combo Kit includes the M18™ FUEL™ 1/2" Drill/Driver (2603-20) 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™ 2.0 Battery is the most durable pack on the market and provides up to 2X more run time . 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.