Cellphone and blue tooth. Way more people have cellphones with some sort of hands free device: work the phone into your gaunt, put your ear bud in, bucket on and your set. I did this for like three events, lost my earbud and now ive retired the cellphone gaunts. Its easier than a walkie talkie and lets you communicate with alot more people. I never got a fellow armored clan member to try it, but it kept me in smooth communication with armor wranglers lol.