Arduino GRBL CNC 3 axis Control board without ATMEGA328

WHAT IS SPECIAL about the Pen Plotter and GRBL CNC 3 axis Control board:

1. Designed for 3 Axis, controlled by USB GRBL Controller or BenBox
2. Input voltage: 12-18V;
3. Stepper motor driver: A4988 or DRV8825 the driver Module sold alone
4. Support stepper motor: 12V, maximum current of 2A ; recommended within 1.5A ; Support stepper motor 42
5. Master chip: ATMEGA328P (arduino uno Bootloader) the chip sold alone
6. Connection interface: USB (USB-CH340)