Bosch 11225VSRH 24-Volt SDS Rotary Hammer Kit 24 volts; 3 amp/hr. battery; 0-4400 impact rate Extended run time of approximately 155 holes on 1 charge SDS-Plus bit system--tool-free bit changes with automatic bit locking, dust protection, and maximum-impact energy-transfer rate Variable-speed reversing trigger for accurate bit starting, as well as removing fasteners or bound bits Pistol-grip handle with compact ergonomic design