Hello Fensterheim, that's a project me and my team had been doing for the past few months. I was heading the product Gecko (we were on Indiegogo, the one Woz endorsed!) which is a BLE tag + accelerometer. By the description of your product I see this is a very similar project that you guys are doing. Are you the guys who are working on Angel wrist bands?
I have a few questions- Is the data transfer needed to be realtime? If so, how do you plan on managing the battery on the BLE device?
If not, you will need to provide details of the sleep cycle. Also, as an aside, if you are designing your hardware, be sure to get the RTC on the board right. We had a few f*ed up nights because of that!
More questions to come as we proceed. :-)
Cheers,
Nitin