Atari Pong Consoles
From Game Tech Wiki
Atari released several dedicated Pong consoles to the home market before their introduction of the Atari VCS 2600 in 1977. The first Pong console bearing the Atari name was released in 1976, and the last Atari console recognized as a Pong console was the Atari Video Pinball, released in 1977. Most Pong consoles of the day had internal speakers which would be used instead of the audio being played by the television speakers, and many had the capability of being powered with batteries.