Atari Flashback 2 Retro Plug and Play version of Atari 2600 1 controller

Preowned Atari Flashback 2 Retro Nostalgia Plug and Play of Atari 2600 One controller. No DC 9V plug. I know nothing about this other than it is supposed to be the plug and play version of the 2600. I have not attempted to find a way to test or play it.. Looked it up and it said The games featured on the Flashback 2 include: 3D Tic-Tac-Toe. Adventure. Adventure II (adaptation of the original Adventure) Aquaventure (prototype) Asteroids. Asteroids Deluxe (hack of Asteroids) Atari Climber (homebrew, originally named Climber 5) Battlezone.