Now here's something that's got to be completely uncommon.
It's Tec Toy Brazil's "Hit Parade" Sonic the hedgehog portable cassette tape player. (So, like a walkman) It IS official, seen here mint on the card which must be an even rare-er sight. The cover of the machine has either a very well modified stock art or a super uncommon image. It's running Sonic, but his hand is out either snapping fingers to the beat (as indicated by tiny lines) or pointing. He is also shown wearing the headphones. This is raised-detail, and full color, as is the classic logo on the side. It has a yellow to orange fade for the background and green music notes.
The card art has him tapping his foot (presumably to music), wearing the headphones and also if you look closely you can see their wire, and also this portable player drawn into his armpit. Since the headphones are nearly on his ears, whoever did the art for the device and the box was actually paying quite nice attention to design. This makes it extra interesting to see.