Usage Tips: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: DC9-40VInput current: 5A(recommended)Output current: 0.5-4AMaximum power: 160WMicro-step: 32 micro stepSize: Approx. 9.5*7*2.7cm / 3.7*2.7*1inchWeight: 148gQuantity: 1pcPackage List:1 x Stepper Motor Driver.