This is a simple mounting case for the DigiRig Mobile sound card device used with amateur radios that do not have an internal sound card. The case has lips to hold the DigiRig in place, plus lash slots for strapping it to the radio or securing elsewhere. Just press the DigiRig device into the case and it will snap into place. I recommend putting non-slip pads on the bottom to help secure it in place. This is an experimental design so build and use at your own risk.