Telstar Ac adapter 9 volt adapter

[Atari the Jedi]

So I was going through the thrift store and found a Telstar AC adapter model 6041. I know that these are kind of common but what I've never seen before was connected on it was a coleco and that states "caution do not use as battery charger: and it seems to fit a 9 volt battery. I'm assuming that it fits some of the old school coleco portable games. I was pretty amazed since it was in the trash pile after testing it it does receive power.

Has anyone seen one of these before?