To the best of my memory, this is a 56 K modem. I stopped using it a long time ago, sometime during the 1990s, I think. It was working correctly at the time. I no longer have any way to test it so I'm offering it as-is, without any guarantee.
I tried to get a good picture of the nameplate, on the bottom, but it's marginal. Hopefully, it can be read well enough.
I also tried to get a good picture of the back. It isn't readable.
The label under the connector is "RS-232C SERIAL PORT". The power
connector is labeled 9 VDC, and the center pin is positive.
Different computers and different monitors have different characteristics and might display colors differently. Therefore, the colors of this item as they appear on your monitor might not be exactly the same as the actual colors of the real item offered for sale.