Stuck on this Crossword Puzzle? Unravel the Mystery of the ‘Device with a Pair of Spools’!

1. Portable music player insert
2. Popular in the 80s and 90s
3. Compact storage device
4. Can fit in a Walkman
5. Magnetic tape technology
6. Has two spools
7. Comes in various sizes
8. Commonly used for recording audio
9. Obsolete technology
10. Uses a cassette player to play.