Features: This module uses TB6560AHQ original chips with low voltage turn-off, overheating stop and over current protection circuit, to ensure optimal performance. Suitable for 42, 57 two phase/four phase/four wire/six wire stepper motors within 3A, not suitable for stepper motor which is more than 3A. Automatic 50% idle current reduction, current automatically reduces by half when it is static, to reduce motor self-locking heat. Current is adjustable step by step to meet your various application requirements. Automatic 50% idle current reduction is adjustable. It uses 6N137 high speed optical coupler, to ensure high speed without loss of synchronization. Heat sink with thick fins and coated with thermal conductive silicone allows 2 times of better heat dissipation than similar products. This product has been fully tested and has been applied to the carving machine, SMT machine equipment, reliable to use. Specification: Working Voltage: DC 10V-35V(It is recommended to use DC24V switch power supply) Maximum Rated Output: ±3A, 3.5Apeak Microstep: 1 step, half step, 1/8, 1/16, maximum 16 microstep Size(L*W*H): 75*50*35mm / 3*2*1.4in Weight: 71g / 2.5oz (approx.) Package list: 1 * Driver Module Note: 1, This is a single-axis driver module, and one driver module can only drive one motor. 2, Check the wiring repeatedly and carefully before powering on. Wrong wiring may burn out the chip. 3, Setting current should not exceed the rated current of motor. 1、This module uses TB6560AHQ original chips with low voltage turn-off, overheating stop and over current protection circuit, to ensure optimal performance. 2、Suitable for 42, 57 two phase/four phase/four wire/six wire stepper motors within 3A, not suitable for stepper motor which is more than 3A. 3、Automatic 50% idle current reduction, current automatically reduces by half when it is static, to reduce motor self-locking heat. 4、Current is adjustable step by step to meet your various application requirements. 5、Heat sink with thick fins and coated with thermal conductive silicone allows 2 times of better heat dissipation than similar products.