SDS-plus® bit system - tool-free bit changes with automatic bit locking, dust protection and maximum impact energy transfer rate Multi-function selector - 3 modes of operation, rotation only, rotary hammer and hammer only mode Variable-speed dial - for accurate bit starting and controlled chipping applications Constant-ResponseTM Circuitry - -Provides soft-start -Maintains constant speed under load -Provides overload protection Service MinderTM light - indicates when preventive maintenance is required, Manufacturer: Bosch