Atari 2600 Plug-and-Play keychains

I had once played Atari once i was a kiddo - probably less than 8 years old and liked Atari games especially 'Centripede'. Now, you can have this Atari keychains and plug it to your TV set and play those retro games such as Asteroids, Millipede, Centipede, Yar's Revenge, Pong, Breakout, and Warlords - via ThinkGeek