My Chatter box is about the same size. I can't remember the last time I used it. It's mounted to my old Icon helmet. Heavy helmet, heavy box lol
They have the new S1 Slim out which is a lot smaller of a unit. I would like to get a chatter box but my friends are even cheaper than me and wont get one themselves.... Though it would be nice for when I go out on long rides and I have people following me. Sometimes when I go on trips I will have friends of mine following me in their car and they all have GMRS/FRS radios to talk between the cars. The chatter box is the only device on the market for riders to have GMRS/FRS radio in the helmet.
I take it you have the S1?
I'd like to find a used S1 slim if I can. That would be nice.