GDA wrote about this release a few months ago here.
"Back in 1992 while Green Day was touring for the Kerplunk album, they made a stop at radio station WMFU in New Jersey to play a set of songs. That live performance was then broadcast on air for listeners in the area to hear. Nearly 20 years later, that performance is being released! The recordings are from the unofficial bootleg "Radio Daze" which has been around since the 90's - this appears to be a repackaging of that bootleg and being made available online."