Motor Driver: 9v-42v Dc Power Supply, H Bridge Bipolar Constant Phase Flow Drive. The Maximum 4.0a Of The Eight Kinds Of Output Current. Motor Driver: Energy-saving Semi-automatic Current Lock Function, Built-in Temperature Protection And Over Current Protection.the Largest 32 Subdivision Of The 6 Models Are Optional. Stepper Motor: 40ncm Holding Torque; Rated Current 1.7a And Resistance 1.5ohms; 1.8 Deg. Step Angle; Bipolar 4-wire. Tips:please Make Sure The Motor Connect To A Constant Current Or Chopper Drive Controller Before You Test Motor.connecting The Motor Directly To A Power Supply Will Destroy The Motor.only The Clock Pulse Signal Can Be Driven Two-phase Bipolar Stepper Motor To Achieve Low Vibration, High Efficiency Work. Tb6600 Stepper Motor Driver: Single Chip Bipolar Sine Microstep Stepper Motor Driver. New Bicd 0.13 Nm Process.up To 42v. 5 Subdivision Mode Options(1/1,1/2,1/4,1/8,1/16,1/32). Output Current:iout=4.0a(peak,in 100ms). Rated Output:iout=3.5 A Resistance(a+)=0.4 Alarm Output Pin