12V 4-phase 5-wire Stepper Motor Gear Motor 28BYJ-48-12V for DIY Project Mainly used in Air Conditioner Louver , Small Cooling/Heating Fan etc., Stable and all technic parameters are qualified for national electronic standard of SJ/T10689-95 Rated voltage:12VDC Number of Phase: 4 Speed Variation Ratio:1/64 Stride Angle:5.625 /64