Features: High-performance MOSFET, default maximum current 6.6A, replacement Rs can reach 15A (need to change the connection method-) High-precision sensorless motor load detection / current control for energy savings up to 75% / quiet operation and smooth motion Onboard 3750V digital isolation; StepStick adapter board optional, SPI direct drive; Specifications: Item: EXT2160 Driver Based on TMC2160 Small Size: As Pictures Voltage Support:19-60V Package Size:approx 15x10x4cm/5.9x3.94x1.57in 2x5 DC3 connector, including SPI 1x7 DIP selector switch- for Standalone mode, current regulation and function configuration Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PC x EXT2160 Driver