This Jekyll and Hyde system is called the Hyperkin SG/FC. It can play both Nintendo NES and the SEGA Genesis console games. It’s basically just a console with both game slots built in. It connects to your TV via an RCA composite video output, and offers stereo audio output. The bundle includes a pair of joypads in the box, so you will be able to start playing all your favorite old school games right away. An eBay search should find you the system for $35 to $45 bucks.