This board is an LCD controller for unattended printing.
It contains a main display, a push-to-select encoder for navigation of menus, a socket for a full sized SD card and an additional button that can be configured as an emergency stop switch or similar.
A really great way to stop your printer being tied to your laptop while still being in control. Because your controller can now read GCODE directly from SD printing is usually smoother around complex features such as curves as well as more reliable than a USB-Serial connection.
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