You can find the model number of your Apple TV in three places.
Check the bottom of your Apple TV
From the Apple TV Home screen, choose Settings > General > About and check the Model.
To see the model number, check the information label on the bottom of your Apple TV.
To find the model number, check the back of the box that your Apple TV came in.
Tell us more about what's happening, and we’ll suggest what you can do next.