For sound examples and specs watch the Warwick Thumb NT 4-String Product Demo - with Andy Irvine:
https://www.youtube.com/watch?v=uXDOmgmeAcQ
Music: Shake It by Andy Irvine
For more information on the instrument go to:
https://goo.gl/xkvyzr
http://www.warwick.de
http://www.framus.de