Features: TMC2208 is quiet two-phase stepper motor drive chip, continuous current 2A, 4.75V-36V. The flexible interpolation unit provides up to 256 subdivisions, allowing perfect sinusoidal control even in systems with limited pulse frequencies; because quiet technology is widely used in 3D printing. Suitable for existing 3D printer electronics, eliminating the expensive costs of redesign. It can replace TMC2100 A4988 LV8729, lower heat, especially for 3D printing market. The adapter comes with headers, so you can use it direct on your 3D printer board. The tester is pre-configured for standalone operation on USB to serial adapter Specifications: Component:ABS Type:1 Set /3 Set Size:Approx.20.2x15.4mm/0.79x0.6inch Package Includes: 2 Optional Package: Package 1 Include:1 Set Stepper Driver Module Package 2 Include:3 Set Stepper Driver Module note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.