Shelleter
From Starfy Wiki
The Shelleter (Japanese: シェルアター) is an item in Densetsu no Starfy 2 and Densetsu no Starfy 3. It does not appear on the Items List in both games. It is an orange tape player that is used to play the Shell Tapes.
Densetsu no Starfy 2
The Shelleter is found in Ogura Castle (Stage 10-1). It is used to play the five Shell Tapes, although it seems that Starfy and Moe never get to see the contents of two of the Shell Tapes.
Densetsu no Starfy 3
The Shelleter is used to play two Shell Tapes in Stage 10-1 (Old Castle) and three Shell Tapes in Stage 10-2.