Description:_x000D_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._x000D__x000D_Features:_x000D__x000D_The current is selected by the dialing switch. _x000D_Seven kind of micro-steps are adjustable. _x000D_Automatic half current reduces heat. _x000D_Large area heat sink can effectively dissipate heat. _x000D_Strong resistance to high frequency interference. _x000D_Input voltage anti-reverse protection. _x000D_Over heat, over current and short circuit protection. _x000D__x000D_Specification:_x000D_Input voltage: DC9-40V_x000D_Input current: 5A(recommended)_x000D_Output current: 0.5-4A_x000D_Max. power: 160W_x000D_Micro-step: 32 micro step_x000D_Size: Approx. 9.5*7*2.7cm / 3.7*2.7*1inch_x000D_Weight: 148g_x000D_Quantity: 1pc_x000D__x000D_Package List:_x000D_1 x Stepper Motor Driver_x000D__x000D__x000D__x000D_Note:_x000D_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