The GDR18V-1800CB25 kit features a 1/4 In. hex impact driver and two CORE18V 4.0 Ah compact batteries, each with next-gen Li-Ion 21700 cell technology. The GDR18V-1800C 18 V 1/4 In. hex impact driver has a compact Impactor design, with a head length only 4.9 In., which makes reaching tight spaces easier. It features the Bosch hammer-and-anvil system to produce 4,000 impacts per minute (IPM) as well as a 3,400 RPM speed. It is able to handle the toughest fastening tasks found on the jobsite. It has Bluetooth connectivity, which connects to optional Connectivity Tool Module to customize tool settings on a connected device. The kit features two CORE18V batteries, which have next-gen Li-Ion 21700 cell technology for optimal performance in a lightweight, high-power battery. The driver has a compact Impactor design, with a head length only 4.9 In. and a weight of only 2.4 Lbs. (tool only, not including battery). It has a variable-speed trigger and an LED light.