Dry Erase Communications Board
The Dry Erase Communication Board is an effective, low-tech AAC tool.
It has two sides, one with a keyboard plus high frequency vocabulary like "yes", "no" and "please". The other side is blank with a dry erase surface.
You can design communication options, or the communicator can create their own with a dry erase marker.
Made of extremely durable plastic with rounded corners. Low tech at its best!