Originally only available as a 'DIY' project, several manufacturers now produce the MULTI-module.
Modules are available to fit in the standard 'JR' style module bay found on most radio systems, or 'Lite' modules available for the smaller module bay of 'Lite' radios.
Some radios are available with internal MULTI-module boards. Internal modules work in exactly the same was as external modules.
All currently-available MULTI-Modules are based on an STM32 micro-processor.
Examples of MULTI-modules currently available:
As well as the different JR and Lite modules, there are other differences in different manufacturer's MULTI-modules:
Most modules have two LEDs, some have none
Some modules have a 16-position selector dial and a button, some do not
Most modules have a USB port, some do not
Radios with internal MULTI-modules include: