Description:
The intelligent controller includes an SD card reader, rotary encoders and a 20-character × 4 line LCD display. You can easily connect it to your RAMPS 1.4 board using "smart adapter" included.
  This panel connect your RAMPS 1.4, you do not need your computer, your SD card intelligent controller power supply. All further operations, such as calibration, the axis movement can be done only with a rotary encoder intelligent controller. 3D design print without a computer, just use the G code design stored on the SD card.