Since this is hackernews, I'll point out that you can use a solvent to remove the card part of a credit card leaving only the chip plus antenna. Then embed in a new housing of your own design.
Since this is hackernews, I'll point out that you can use a solvent to remove the card part of a credit card leaving only the chip plus antenna. Then embed in a new housing of your own design.
Ya, and then attach it to the back of your watch...
Yeah, Hornady makes a nice rubber thingy that you can slide onto a watch band with their RFID tag inside, but it's easy to swap it with a t5577 or whatever