Features: TMC2209 quiet motor driver IC- (original imported chip) for two-phase stepping motor. The TMC2209 compatible with-many traditional drivers- and TMC2208 pins-. Excellent mute- effect, large heat sink, good heat dissipation Support for sensorless feedback function Support UART mode- by attaching jumper-caps instead of soldering on mks- gen-L V2.0 skr1.3/1.4 mks- sgen-L. Specifications: Item: TMC2209 v2.0 Stepping Motor Driver Hardware compatible with-StepStick- and Pololu- A4988 Max-Current: 2.5A Step/Dir interface with microstep interpolation (up to 256 microsteps) Input voltage: 5.5V-28V Package Size: approx 9x13mm/3.54x5.12in Package Includes: 1PC x TMC2209V2.0 Stepping Motor Driver 1PC x Heatsink note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment