The 2799-22CX M18 2-Tool Combo Kit includes the 1/2" Compact Brushless Hammer Drill Driver (2702-20) and the 1/4" Hex Brushless Impact Driver (2750-20). The M18 Cordless System's patented technologies and electronics, innovative motor design, and superior ergonomics provide the most efficient blend of power, weight and performance in the industry. The M18 1/2" Compact Brushless Hammer Drill/Driver is the Most Compact 18v drill on the market and delivers Over 50 percent Longer Run-Time than drills with brushed motors. The M18 1/4" Hex Brushless Impact Driver is the Most Compact Impact Driver in its class and delivers Over 50 percent Longer Run-Time than Impact Drivers with brushed motors. Both tools feature Milwaukee built brushless motors, REDLINK Electronics, and REDLITHIUM batteries that provide more efficient power delivery, for fewer trips to the charger. This kit includes (1) REDLITHIUM XC4.0 battery for maximum performance and 2X longer run-time. It also includes (1) REDLITHIUM 2.0 battery, which is compact and light weight, ideal for fastening applications.