I really like where you're going with these. I like the green circle and back #40. Can we try a green with a slightly darker hue and vibrance? Also on the right edge of the circle, is there a way that we can incorporate the idea of proximity communication or radar - maybe this is a jagged edge or concentric circles or something else.
Also really like #14. I see a "cb". I see an "on" button. I see a bluetooth punn with the b symbol.
Please keep more variations coming. Maybe you can incorporate the actual bluetooth symbol in. For example instead of a backwards play button, maybe that icon is the lower part of the bluetooth logo flipped 180 degrees.