What you really want to know is which type is it.
TK-8180-K1 (FCC ID's K4437313210 and K4437313110)
TK-8180-K2 (FCC ID's K4437313220 and K4437313120)
You can check the detailed FCC certifications by typing in the above FCC ID's into the following website, then click on search.
https://fccid.io/
The difference is the "band split", the frequency range over which the radio is specified to work. The -K1 type is either a 450 MHz to 512 MHz or a 450 MHz to 520 MHz model depending on if its the lower or higher power model. Both are FCC Part 95 certified, legal to use for GMRS. The -K2 types are only certified as Part 90 radios.
Both types will do wide or narrow band FM.
Before buying a radio I normally do a search for the manufacture's sales brochure. They are a good source to see what the general features and the technical specifications are for the radio in question. In your case look here. This saves a lot of time asking for info.
http://www.swscomm.com/kenwood/TK-7180_8180.pdf
When buying a used radio make absolutely sure you look at a photo of the radio's name plate, which shows the exact model type, FCC ID and serial number. It's not uncommon for sellers to screw up the description, in at least one case for me a deliberate case of misrepresentation, the seller shipped a radio that did not match the name plate on the one in the ad photos, different band split which was totally useless for my needs, I did get a full refund through eBay. In another case the radio was not FCC certified, no FCC ID, it was an European type that required a different version of the software to program it, which was hard to find. That radio works fine but is an odd ball in my collection. The code plugs from the US and European types of the same base model are not interchangeable so I have to maintain two versions for this one.
One more thing about buying used radios, passwords. Almost, if not all, commercial radios can be password lock preventing the radio contents from being read out, which almost nobody really cares about, and the second prevent the radio from being reprogrammed with a new code plug. If you get a radio with a write password, and you don't have a version of the programming software with an "Engineer's" level install key, you can't load a new code plug in the radio. Your only options is find somebody who has the software to bypass the password or take it to a radio shop, or Kenwood service, pay a ridiculously high bench fee for the tech to do 5 minutes of work clearing out the old passwords. I've had a few radios like this that where I have the software to bypass the passwords for those models. The seller may not even know if the radio is password locked or not. You can ask before purchasing and see if they know for sure or not.