Hardware-wise, this is just a normal slim 20GB iPod 4th Genration having an exclusive black front and a red clickwheel, and also having laser-engraved signatures of U2 members on the back, and the U2 logo. However, just like all other Gen 4 units I have, its battery is dead.

iPod U2 Edition (4th Gen)

iPod U2 Edition (4th Gen)
Release Year 2004
Capacity 20 GB
Apple Order No. M9787LL/A
Model Number A1059 (EMC 1995)
Actual Capacity 20 GB, 20 GB