Model: Bosch GSR BitDrive Professional The most convenient screwdriver - Always the right screw bit at hand. No longer bit searching Innovative Bosch Easy Select function with 12 most common bits always on the tool for fast bit changing Micro USB port for convenient charging Compactness Slim, light, easy to use in tight space Li-ion: No memory effect and very little self-dischargeLi-ion: No memory effect and very little self-discharge