files in this zip are:

1. readme.txt  this file.
2. case_lid.stl the lid for the transmitter case.
3. bottom_half.stl the bottom main part of the case.
4. 80mbase.stl the sub chaassis that the PCB mounts on. Glue inside case.
5. audio_jack_holder.stl  a bracket to hold optional audio jack for tone outputs.
6. 9vbattery_adaptor.stl a test adaptor for testbench testing with a powersupply.

All units are mm