The Bosch Litheon 36-volt Bulldog cordless rotary hammer is made to tackle the toughest job site tasks with ease. It drills faster and harder than many other corded or cordless models, up to 7.1-inches/minute with a surprising level of comfort; and the 36-volt battery may perform like a monster, but it's as light as its 18-volt counterparts. Lighter construction means better maneuverability, more precision, and accuracy that can't be beat. The 11536VSR is created to toil like a heavy-duty professional tool, but its fine-tuning features make it a joy to use. Its well balanced, streamlined design minimizes vibration and keeps the noise down to a dull roar, and the variable speed, reversing trigger makes all kinds of jobs a breeze. Speed it up, slow it down, or reverse it and select from three different modes of operation: rotation only, rotary hammer, and hammer only.