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NOTE: In order to ensure product quality, please look for "FBA / Fulfillment By Amazon". Shipped from other countries or regions, not our original authentic products, we can not guarantee product quality. Special reminder: Note installation direction, otherwise it may even drive the motherboard burned. Package included: 1*Stepper motor control board expansion board(A4988 DRV8825 are not included ). If you for any reason are not happy with any product supplied , please do not hesitate to contact us and we will do our best to solve your problem .