van halen sunday afternoon in the park

I think I used to know but I just listened to it for the first time in awhile and I’m a bit confused. Ed’s playing a synthesizer correct? I know this might be a dumb question but I thought I remembered reading that it was just some kind of little noise maker thing he found lying around, it might have actually been some kind of cardboard childrens keyboard thing he found….my memory is totally failing me on this right now…did they ever actually play this (I know mike played it on