Efficient powerful motor produces 1, 800 In.-Lbs. of torque. EC Brushless 18V motor and CORE18V battery for top performance. Bluetooth connectivity (when the optional GCY30-4 Connectivity Tool Module is installed) – links the impact driver to the free Bosch Toolbox app on a connected device to customize settings and provide detailed feedback for optimized tool cont. Powerful EC Brushless motor – delivers a max of 1, 800 In.-Lbs. of torque and up to 4, 200 ipm for professional power. Hammer-and-anvil system – designed for maximum impact energy. Single-focLED light – located on the head of the driver for outstanding illumination. Electronic Cell and Motor Protection – helps protect the tool and battery from overloading conditions.