Powered by FUEL technology, the M18 FUEL 1 in. SDS plus rotary hammer delivers faster than corded speed, corded durability, and all day work on one charge. The Milwaukee POWERSTATE brushless motor provides 1.7 ft-lbs of impact energy, 0-1, 400 RPM and 0-4,900 BPM. The Milwaukee REDLITHIUM XC 4.0 battery packs (sold separately) provide all day work on one charge, 20% more power and 2X more recharges than standard lithium-ion batteries. REDLINK Plusintelligence integrates full-circle communication between tool, battery and charger to protect from overloading, overheating, and over-discharging.