From 1982 Odyssey² catalog
With the Voice of Odyssey², you add the new and exciting dimension of speech and enhanced sound to home video entertainment.
Realistic sound effect bring your game to life! You'll hear lasers whizzing. asteroids crashing, tires screeching, voices talking ... and much, much more!
The Voice is fully self-contained and features its own speaker and volume control. It's easy to install by quickly "plugging into" any Odyssey² console.
Once installed, you need never remover it. The Voice becomes and integral part of Odyssey² operation and accepts all of your Odyssey² cartridges - including a whole new generation of "talking" arcade, educational and Master Strategy games