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4 Phase 5 Wire Gear ULN2003 28byj48 28BYJ-48 DC Mini Micro 5V Stepper Motor Parameter: No-load pull into the frequency:>600Hz No-load pull-out frequency: >1000Hz Reduction ratio: 1/64 Step Angle: 5.625 /64 Self-positioning torque: >34.3mN.m DCR: 2007%(25c) Insulation resistance: >10M(500V) Noise: <40dB(120Hz,No load,10cm) Dielectric Strength: 600VAC/1mA/1s Weight: 32g Diameter: 27mm. Voltage: 5V. Step angle: 5.625 x 1/64. Reduction ratio: 1/64.