This is the system in my own audio equipped ride. The main box is the size of a cigarette pack and has physical connections to helmet headsets, MP3 players, cell phones, communication radios, and other audio sources.

This is the system in my own audio equipped ride. The main box is the size of a cigarette pack and has physical connections to helmet headsets, MP3 players, cell phones, communication radios, and other audio sources.

This is the system in my own audio equipped ride. The main box is the size of a cigarette pack and has physical connections to helmet headsets, MP3 players, cell phones, communication radios, and other audio sources. Photo by Wayne Roth.