An ibutton embedded computer is contained in these rings. They can be used like a smartcard to hold 1024 bit RSA keys for contact authorization or other uses. It is apparently possible to load your own applets into the ring.These rings are hard to find, and sell for up to $90 on Ebay.The ring size is about10 or 11, will fit right the average fingers.

Shipping is free for continental US.Additional shipping charges outside the US apply.