Feature: 1. Motor Driver: With this step motor driver TMC2209, you will find it easier to have accurate control over your 3D printer. 2. Easy Working: Supports uart mode by putting on jumper caps instead of soldering on mks gen_1V2.0, skr1.3/1.4, mks sgen_1. 3. Reliable Use: Enables sensorless feedback function, the motor drive module enables high sensitivity for efficient working. 4. Lower Noises: There is no noise during operation, and the easy but flexible connection makes the installation simpler. 5. Fast Cooling: A heat sink is also included in the set, which ensures quick cooling to maintain stable and reliable working. Specification: 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 1/256. Mode: Dir and step, uart. Microstep Setting: Microstep cadre MO M1 STEP GND GND 8 vCC_10 GND 32 GND vCC_10 64 vCC_10 vCC_10 16 . Package List: 1 x Step Motor Driver1 x Heat Sink Note: 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.