Features: The newly developed board frame is used to match new connectors to improve user experience. .Using a new customized heatsink, while enhancing the heat dissipation capacity, it protects the driver chip from external damage. Support StealthChop, which can realize the mute- lock of the motor and the mute- when running at low speed. It is recommended- to select when the maximum speed of the motor is lower than 300RPM. Supports SpreadCycle, which can achieve mute- and low power consumption in a wide-range of speed and torque-. Support StallGuard2: when there is no limit-switch, it can be used for motor stall detection (limit switch- is recommended-). Specifications: Item：EZ2209 Stepper Motor Driver Quantity:5PCS Size：As PIctures Package Includes: 5PCS EZ2209 Stepper Motor Driver note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.