This Bosch hammer drill is engineered for tough jobs, with next-gen convenience and CORE18V power. The GSB18V-535CB25 18V EC Brushless Connected-Ready Compact Tough 1/2 In. hammer drill kit features a tool with Bluetooth connectivity (which connects with an optional Connectivity Tool Module), linking the free Bosch Toolbox app on any connected device for enhanced tool control and feedback. The kit includes two next-gen CORE18V 4.0 Ah compact batteries. Each keeps the power and runtime, while losing the weight, with 21700 cell technology. The CORE18V matches the power of the original two-layer 4.0 Ah battery with half the number of cells. It features the CoolPack 2.0 heat-management system. This hammer drill's powerful EC Brushless motor delivers 535 In.-Lbs. of torque and 0-28,500 bpm. It has variable speed settings, one for high-speed (0-1,900 rpm) and one for high power (0-600 rpm). The cordless drill has KickBack Control to reduce the risk from sudden rotational torque reaction.