Features: brand new and high quality With large heat sink, good heat dissipation. Super silent. Support sensorless-homing function Support UART mode by set jumper caps instes of welding on mks gen_l V2.0, skr1.3/1, mks sgen_l. UART Mode: Uart mode can be used on mks gen_l(V2.X),mks sgen_l, skr1.3/1.4 by set jumper cap like below : MKS Sgen_L / MKS Gen_L Sensorless-homing function: Used on mks gen_l (V2.X), mks sgen_l, skr1.3/1.4 by set jumper cap like below : MKS Sgen_L / MKS Gen_L Specifications: Default Current：1.25A Max current：2.5A Logic Voltage： 3.3V/5V Input Voltage : 5.5V-28V Microstep: up to 1/256 Mode: dir/step, UART Size：approx 3x2cm/1.18x 0.79in Package Includes: 2 PCS x TMC2209 Motor Drives with Heatsinks note: Pay attention to the connection direction, do not reverse it. The motor direction is opposite to that of A4988 and DRV8825, please adjust the firmware or adjust the motor wiring if you want to change A4988. Dir/step mode used in the printer control board, please pay attentioin to set the jumper cap Ms1 Ms2 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.