28mm Rotary Tattoo Machine Planetary Gearbox Motor Main voltage : 12VDC,24VDC Typical applications: Instrument,Electric tool,Automatic door-lock, Medical equipment,Security monitorin,Car lock Remark: Gear Motor Torque=Driving motor torqueReduction ratioGearbox efficiency; Gear Motor Speed=Driving motor speed/Reduction ratio Motor detailed config can be customized