POWERFUL 14.5-AMP MOTOR - DELIVERS 9.3 FT.-LBS. OF IMPACT ENERGY IN A 20-LBS. COMBO HAMMER VIBRATION CONTROL - FOR ALL DAY JOBS, TOOL ALLOWS FOR MAXIMUM USER COMFORT DUAL-MODE SELECTOR - TWO MODES OF OPERATION, ROTARY HAMMER AND HAMMER-ONLY MODE CONSTANT RESPONSE CIRCUITRY - FOR SOFT-START, CONSTANT SPEED UNDER LOAD AND OVERLOAD PROTECTION ELECTRO-PNEUMATIC IMPACT SYSTEM - MAXIMIZES IMPACT FORCE AND MINIMIZES VIBRATION SDS-MAX BIT SYSTEM - TOOL-FREE BIT CHANGES WITH AUTOMATIC BIT LOCKING, DUST PROTECTION AND MAXIMUM IMPACT ENERGY TRANSFER RATE VARIABLE-SPEED DIAL - FOR ACCURATE BIT STARTING AND CONTROLLED CHIPPING APPLICATIONS PADDED REAR HANDLE - ABSORBS SHOCK FOR OPERATOR COMFORT INTEGRAL CLUTCH - HELPS MINIMIZE TORQUE REACTION TURBO POWER FEATURE - 20 PERCENT POWER BOOST IN HAMMER-ONLY MODE