Li-ion Battery For A Steady Level Of Power Throughout The Charge & Longer Battery Life Fast-impact Driving With A No-load Speed Of Up To 2400rpm & A 3200bpm Impact Rate 1280in-lbs Of Driving Torque For Heavy Applications Like Tightening Carriage Bolts Driving Lags & Sinking Deck Screws Quick-change 1 and 4" Hex Chuck For Simple Bit Replacements Hitachi Lifetime Li-ion Tool Warranty & A 2-year Li-ion Battery Warranty