Bosch IDS181 18-volt Lithium-ion Compact 1/4-inch Hex Impact Driver (Bare Tool) 3-LED Ring: Provides shadow free illumination for the best visibility in low lighting applications Electronic Cell Protection (ECP) - Increases battery lifetime by preventing damage caused by misuse 18-volt 1/4-Inch Hex Impact Driver features an ultra-compact design Superior Ergonomics: Slim, soft grip provides maximum comfort and control during fastening