AC Adapter Question

[RandomFox]

I apologize if this has already been answered, or this is against the rules.

I have come in possession of an AC unit which, in google, led me to this site when I typed in its specs. It is allegedly a sega genesis 1 compatible AC unit, but when the person said they were using it for their NES/famicon I grew a bit worried. I was wondering if someone could help me identify it, what it is compatible with etc. I am half tempted to just return it but they are in Honolulu, the shipping would negate the effort.

I am looking at a:

EC
AC/DC Adaptor
Class 2 Power Supply
Model: HK41U-0900800
Input: 120V AC 60hz 16w
Output 9.0V 800mA

on the bottom, it has a picture of a plus and negative symbol, with the negative connecting in the middle. I am assuming this is a negative connector pin symbol.

Any help would be greatly appreciated. After receiving the item I am assuming the seller wouldn't know too much about it, and if this is a famicon/NES type plug (based on what I read in the other thread the person was using it for), I wouldn't want to catch a fire with it. Even though the plug seems in pristine, new condition.

Thank you in advance.

P.S. This is the only website which yields any search results, another reason for my posting. Again I apologize if it is out of place.

[Xious]

That'll work splendidly.

Mods: I'd like to do a sticky FAQ  topic on this subject to put in this board... That way we can be proactive in answering AC-Adapter questions. 

[UglyJoe]

Write it up and post it.  One of us will sticky it.

[RandomFox]

Thank you very much for the reply that's a relief.

[Xious]

I posted it, with the three major questions. I'lll expand it as I can, and if anyone has any questions they want me to add to it, go ahead and reply  or send me a P.M. and I will add them.