There are still over-the-air TV channels being broadcast, and the TV-Tuner also has composite video, and audio inputs, so you could use the Game Gear as a display for other consoles.
Unfortunately, you have to have the "flat-screen" Game Gear in order to use the TV-tuner. There are three variations:
The flat screen, with the coloured Game Gear logo.
The Bubble screen with the coloured logo.
and the bubble screen with a white logo.
This site has a better description, and a few photos.
I want the TV-Tuner as well, but it doesn't work on my Game Gear, I have the bubble screen, coloured logo.
