Makita BHP451 LXT 18-Volt Lithium-Ion Hammer Drill/Driver LXT Lithium-Ion battery and optimum charging system produces 280% more lifetime work with 2x more cycles. 3-speed design produces 25% faster working speed with more efficiency-inch a wider range of applications Shift Lock Driver System quickly shifts from in hammer drill-inch to in driver-inch mode with one touch Ergonomic shape fits like a glove with even pressure and easy control Compact design at only 9-7/8-inch length and weighs only 4.9-pounds for less operator fatigue