A4988 driver board widely used in 3D printers and small CNC machines Easy to useThe stepper motor driver driver module has direction and step control interface simple, short-to-ground and short-circuit protection Key features: The motor driver module is an intelligent control that automatically selects the correct current decay mode (fast decay or slow decrease). Overheat thermal shutdown, under-voltage lockout, and short-circuit protection Five different resolutions: full-step, half-step, quarter-step, eight-step, and six-step. Shipping from Germany - Fast delivery (1-2 days after receipt of order) - Fast and assured Adjustable current control allows you to set the maximum output current with a potentiometer, which allows you to use voltages above your stepper motor's rated voltage to achieve higher speeds Product Description Features: Step mode: full, half, 1/4, 1/8 and 1/16. Output driver capacity: 35V, 2A. Driver size driver: 2015mm. Heat sink size: 55mm. Contents: 1 module of a4988 driver. 1 heat sink.