Description: This Stepper Motor Driver provides over heat, over current and short circuit protection. Seven kind micro steps can be adjusted. Large area heat sink can effectively dissipate heat.Features:The current is selected by the dialing switch. Seven kind of micro-steps are adjustable. Automatic half current reduces heat. Large area heat sink can effectively dissipate heat. Strong resistance to high frequency interference. Input voltage anti-reverse protection. Over heat, over current and short circuit protection. Specification: Input voltage: DC9-40V Input current: 5A(recommended) Output current: 0.5-4A Max. power: 160W Micro-step: 32 micro step Size: Approx. 9.5*7*2.7cm / 3.7*2.7*1inch Weight: 148g Quantity: 1pcPackage List: 1 x Stepper Motor DriverNote: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1The current is selected by the dialing switch. 2Seven kind of micro?steps are adjustable. 3Automatic half current reduces heat. 4Large area heat sink can effectively dissipate heat. 5Strong resistance to high frequency interference.1 x Stepper Motor Driver Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.