Nice, moreover because you've focused on the design aspects of it. But since this is ShowHN, I'm gonna ask the usual questions:
1. Data capacity
2. Battery capacity (in mAh)
3. Weight
4. Build Materials composition
thanks,it doesn't contain any battery ,it contains a usb cable,so you can charge your phone with.Right now we only finish our prototype which is made from stainless steel,weighs nearly 3.5oz(100g),works with 32gb sd-card(haven't test other capacity yet).
how does it charge your phone without a battery inside the bracelet?
Sorry, it's my mistake that didn't explain it clearly. Our bracelet isn't a power bank, it has a built-in usb cable to help you connect your phone to a charger, so there is no battery inside.
ah - you need to be clear about that - because batteries are heavy and would make the bracelet warm and unwieldy :-(
You might want to add a SoC to it, e.g. Intel Edison.
thanks,we will try it later, but intel's size is too big for us.