Bosch IDS181-01 18-Volt Lithium-Ion Compact 1/4-Inch Hex Impact Driver with 2 Lithium-Ion 4.0-Ah High Capacity Batteries Most compact impactor design with a head length of 5.4-Inch, allowing the tool to be used in tight and hard to reach places with increased comfort Optimized Impact Performance: Provides the best runtime and control for small to medium duty fastening jobs Integrated 3-LED Ring: Provides shadow free illumination for the best visibility in low lighting applications Superior Ergonomics: Slim, soft grip provides maximum comfort and control during fastening applications Electronic Cell Protection (ECP) - Increases battery lifetime by preventing damage caused by misuse