A4988 driver board is widely used in 3D printers and small CNC machines. Easy to use: The stepper motor driver module has a simple interface for direction and step control, short circuit 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 decay). Thermal overheating, undervoltage protection and short circuit protection. Five different resolutions: full step, half step, quarter step, eighth step and sixteenth step. Shipping from Germany - Fast delivery (1-2 days after receipt of order) - Fast and safe. Adjustable current control allows you to set the maximum output current with a potentiometer, which allows you to use voltages above the stepper motor's rated voltage to achieve higher speeds. Product description Features: Step mode: full, half, 1/4, 1/8 and 1/16. Output drive capability: 35V, ±2A. Driver size: 20×15mm. Heatsink size: 5×5mm. Contents: 1 module of a4988 driver. 1 heatsink. With the concept of customer first, we provide you with 24/7 after-sales service. No matter where you are or what problems you encounter, we will solve them for you as soon as possible to ensure that your shopping experience is worry-free.