I wish I still had them, but once upon a time I had a walkie talky(one of the ones that voices which channel your on) with a snug headset(fit under my helmet), managed to take the walky apart, and wire in a small box with two buttons for up and down, clipped the walky to my belt, hooked the remote to my handlebars, and used the up/down to select channel. Only one was made though, but you could direct multiple people that way if you were on point.
This is my trike. There are many like it but this one is mine. My trike is my best friend, and it is my life. I must master it as I must master myself. My trike without me is useless. Without my trike, I am useless. I must ride my trike true. My trike and I know that what counts is not the amount of miles we ride, but the time we ride together. My trike is human in it's own ways, therefore I will learn it as my brother. I will learn it's weaknesses, it's strengths, it's parts, and it's soul.