I'm writing a Science Fiction book. While this book doesn't push reality very far, there are some new technologies and tools that I have added. One tool is used more frequently than all the others, and it has a very complex system (although there are other systems just as complex used somewhat less frequently in the story). For the sake of this question, we'll call it MYTO. The protagonist and the other supporting characters use MYTO on a regular basis, and an adequate understanding of it is critical to understanding and enjoying the story due to the frequent use of it. Normally, it wouldn't be a problem for me to introduce it and describe its functions. However, due to the complexity of MYTO and the systems surrounding it, I've found myself in a bit of a predicament.
I've written several drafts and concepts trying to describe MYTO and the systems it uses, and I've ruled out an all-at-once approach - it would take too long, and the reader would get lost and bored. Because MYTO is used in settings with high action, it is very difficult to describe it as I go along.
For a bit of a background, MYTO was a pre-existing technology based on other communication technologies used by the military and special forces in my story. My main character took it and modified it to create an improved version with several more functions and more polished functionality. I've tried to write this out, but it also gets very technical and boring, so I'm put back to square one.
How should I go about introducing the technology and its functions? Some of the functions can and have been explained throughout the story as needed, but they are lesser functions.
If any additional information is needed, please let me know in the comments.