1. About TMC2208 Stepper Motor Driver: 2. TMC2208 single-axis stepping motor driver chip, power tube built-in drive current 1.4A peak current 2A, voltage range 4.75V-36V, 256 subdivision UART configuration interface (9600...500k Baud) 3. Up to 256 native micro steps (without interpolation) 4. StealthChop2 - faster motor acceleration/deceleration than stealthChop 5. Automatic stealthChop and spreadCycle switchover depending on the velocity 6. Quantity: 1 set 7. Material: FR4 8. Dimensions: 6 cm x 4.8 cm x 1 cm 9. Weight: 20g 10. Package Included: - 1 x TMC2208 Driver - 1 x Heatsink - 1 x Screwdriver Note: * Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully.