Ok. Do you get a choice of cable lengths too? I could see where that would be something I would want options for, clip it on a shirt, or in a ponytail, etc.
Yes, that is the main thing you will be picking out besides colors. I believe you get a choice of two cable lengths. I don't remember the choices off the bat. I do not have a Neptune as my insurance denied it and I decided not to fight them further after they denied my appeal because I need to save it for the Naida CI (I knew it was coming last year.) I am choosing which battle I will win.
The Neptune is small! The pictures just don't do it any justice. Somehow, it looks deceptively bigger in photos. In reality, it is the size of a tube of lipstick, just slightly wider with the Connect module (the Volume, Sensitivity, Program Slot Switch, and direct connect input module.) You don't have to have the Connect module connected for it to function after you set your settings and you are required to remove it for swimming.
I used it as part of testing of the Optima strategy, so I got to try it out for a month. You can use it with a lanyard around your neck, which is how I preferred to wear it (under my shirt.) You can also clip it anywhere, really. The shorter the cable, the less pulling there is.
I loved the Neptune for the ease of direct-connecting. I'd have a mix of external microphone so I could continue to hear what was around me while having my music piped directly to my brain.
It's like the best pair of headphones you can have (as well as the most expensive!) You can use a bluetooth headset clip (a small bluetooth receiver that allows you to plug in your choice of headphones, but instead of headphones you just plug a cable from it to the Neptune) so that you can wirelessly pipe music and phone calls via direct connect.
It's a great rugged option to have with the battery configuration. You probably wouldn't want to have to use it as your full-time, only processor choice, but you will love having the option if you go with it.