DC5V-12V 2 Phase 4 Wire Gear Reducer Stepper Motor 15mm Mini Metal GearBoxSpecification:Size: 15mmStep angle: 18   \/ 232Reduction ratio: 232: 1 (about 4640 pulses revolution)Phase resistance: 40 ohmVoltage: 5V-12V DCSuitable for: Monitoring head swing motor control、 intelligent control motor Micro MachinesPacking includes:1 x Mini Metal GearBox