Unused for many years but still works (tested). 9V battery required (two pin mains adapter included)
https://www.youtube.com/watch?v=pf4OIa8Q21c&feature=youtu.be
Free to a guitar player.
Nady Wireless guitar system DKW-1 (Wantage OX12 Letcombe Regis)
This offer has been gifted to someone and is no longer available.