The Odyssey 2000 (Model BH7510) dedicated console was released in 1977. The 2000 was basically an updated version of the Odyssey 300. Like the 300, the Odyssey 2000 uses the AY-3-8500 single-chip design (which is also used in the Odyssey 3000). The Odyssey 2000 is set up for two players and uses a single rotating knob for each player's game control instead of the three knobs used by earlier Magnavox dedicated video game consoles. In addition to the Tennis, Hockey and Squash ("Smash") game variations, the 2000 adds the Practice variation of one-player squash. Points scored during gameplay are shown at the top of the screen when each player scores, and the winner is the first player to gain 15 points. Like earlier Odyssey models, the 2000 is powered by either six "C" batteries or an optional AC adapter.
Source: Wikipedia, "[en.wikipedia.org/wiki/Magnavox_Odyssey_series%23Odyssey_2000 Magnavox Odyssey series]", available under the CC-BY-SA License.