Original Creality Silent Mainboard for Ender 5 plus, CR-10S, CR-10 S4, CR-10 S5, CR-X, CR-20, CR-20 PRO 3D printer.Voltage: Works on 12V and 24VCreality V2.2.1 PCB:Different from Regular V2.2 Board, in the position of stepper motor driver chip, the resistance value is different (can be directly observed on the motherboard).Conventional: R100 mute: R150After sale service and technical supportIf you have any issue, please kindly contact us. We will reply as soon as possible within 24 hours.We will offer you profesional customer support and strive our best to offer your solutions. If you have any question, please feel free to contact us.