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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).

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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 :-(

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