3-Mode Switch for rotation only, hammering with rotation, or hammering only2x faster drilling with synchronized RPM and BPM for more efficient drillingBuilt-in torque limiter clutch disengages if bit jams when hitting rebarChisel rotates 360° with 40 different positions to get the best workingCompact and lightweight design for less operator fatigueErgonomic shape fits like a glove with even pressure and easy controlLXT Lithium-Ion provides longer run time, 5x lower self-discharge (for use any time) and 16 firm holding contact terminals (for constant high power)45-minute Optimum Charger and battery communicates throughout the charging process using the built-in chip in the battery and built-in CPU chip in the charger. The Charger also uses "Active 3 Control" for current control, thermal control & voltage control45-minute Optimum Charger has a built-in fan to cool the battery to produce more lifetime work