This is a demo of the Sonuus G2M Universal Guitar to MIDI Converter, a monophonic audio to MIDI converter.

The Sonuus G2M can be used to generate MIDI instrument sounds from a synthesizer and does not require a special pickup.

via MarkFromHawaii:

At less than $100 USD street price, it’s a fun, affordable gadget that you may want to add to your live or recording rig. It can also be used with music publishing software to create on-the-fly transpositions of guitar melody lines.