Bluetooth Pens

I'm looking for a bluetooth pen that doesn't need special paper or a sensor attached to the page. I saw one somewhere and can't seem to find it anymore.

Here is what I'm talking about. These either need special paper of a sensor:
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  1. I don't think such a thing exists, except maybe in a lab or a mock-up.
  2. dEAne said:

    Both of those need special paper, which he did not want.
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