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Product Features: 1. Toshiba TB6560AHQ chip - maximum 3.5 Adrive current, more powerful. 2. 1 - 1/16 microstep setting - higher accuracy, smoother operation. 3. Overload & over-current & over-temperature protection, full protection of your computer and peripheral equipment. 4. 4 files current settings can be set according to the user the actual current requirement. 5. Full closed-type optical isolation to protect the user's computer and equipment. 6. Professional design, two-stage signal processing, super anti-jamming. 7. Bipolar constant current chopper drive motor low-speed non-creeping phenomenon, noise, non-resonant region. 8. Four input control, you can set limit, emergency stop, which is divided into pairs of knives.