Bosch SGH182B Bare-Tool 18-Volt Brushless Drywall Screwdriver Longest runtime for continuous work (Up to 3,400 screws per battery charge with 4.0 Ah battery) Lock-on button for continuous work Bosch EC brushless motor technology for long lifetime Bosch Electronic Cell Protection (ECP) protects the battery against overload, overheating, and deep discharge Integrated LED light for illuminating the work area, even in dark places