6 Speed adjustment,12-volt output, With the , Speed regulation ,3 powerful speed selections with scattered vent holes, this rotary tool can generate strong and steady power. Variable speed from 3,000 to 18000 RPM Type Mini Grinder Power Source Electricity Clamping range: 0.5-3.2mm Speed range: 3000-1800rpm/min Input voltage: 100-240V Output voltage: 12V Rated power: 13W Power type : Plug-in use Disc Diameter 0.5-3.2mm No-Load Speed 3000-18000RPM,6 Speed adjustment