That’s not what it’s about. Voice is the name of this interesting new device from Artioli Designs which allows a guitarist to “hold down” a common first position chord form, leaving the left hand free to either solo over the chord or add alternate voicings. It fits over the first four frets of the fingerboard, and will hold down any chord shape which you make using the Voice Capo’s corresponding buttons.
Here’s a video that demonstrates its operation.
More information can be found on the Voice web site, including details an how the capo is fine tuned to work properly with an individual guitar. Retail price is listed as $99.