Bosch 11316EVS-46 14 Amp SDS-Max Demolition Hammer (Certified Refurbished) Reconditioned Bosch Products have a One-year warranty through the Bosch factory or an authorized service center SDS-max bit system - tool-free bit changes with automatic bit locking, dust protection and maximum impact energy transfer rate Variable-speed dial - for controlled chipping applications Constant Response Circuitry - - Provides soft-start - Maintains constant speed under load - Provides overload protection Service Minder light - indicates when preventative maintenance is required