Bosch GSB18V-535CB15 Impact Tough™ Brushless Hammer Drill Driver 18V with 4.0 Ah Core Compact Battery, Charger, Bit Holder, (4) Bits, Belt Clip, and Carrying Bag is engineered for tough jobs, with next-gen convenience and CORE18 V power. The GSB18 V-535CB15 18 V EC Brushless Connected-Ready Compact Tough 1/2 In. hammer drill features 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 a next-gen CORE18 V Compact battery. It keeps the power and runtime, while losing the weight, with 21700 cell technology. The CORE18 V 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 and 100% compatibility with Bosch 18 V tools and 18 V Lithium-ion battery chargers. 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, a 20+1 precision clutch; an all-metal chuck that provides durability and a longer belt clip.