1Motor Driver: With this step motor driver TMC2209, you will find it easier to have accurate control over your 3D printer. 2Easy Working: Supports uart mode by putting on jumper caps instead of soldering on mks gen_1V2.0, skr1.3 or 1.4, mks sgen_1. 3Reliable Use: Enables sensorless feedback function, the motor drive module enables high sensitivity for efficient working. 4Lower Noises: There is no noise during operation, and the easy but flexible connection makes the installation simpler. 5Fast Cooling: A heat sink is also included in the set, which ensures quick cooling to maintain stable and reliable working. Item Type: Step Motor Driver Material: Aluminium Default Current: 1.25A Maximum Current: 2.5A Logic Voltage: 3.3V or 5V. Input Voltage: 5.5V-28V. Microstep: Up to 1 or 256. Mode: Dir and step, uart. Microstep Setting: Microstep cadre MOM1STEP GNDGND8 vCC_10GND32 GNDvCC_1064 vCC_10vCC_1016 1 x Step Motor Driver 1 x Heat Sink Operator's Use Precautions: 1. Verf measures the voltage of Gnd and potentiometer. 2. Please do not connect the motor when measuring the voltage, otherwise the drive will be burnt easily. 3. Please connect the power supply when measuring the voltage, don't just connect the USB power supply. 4. Please pay attention to the direction and do not insert it by mistake.