Califone 8100 series Owner's Manual page 14

Headphones
The 8100-HP Headphone is the replacement headphone for the MP3 Player.
Califone also recommends the following over-ear ambient
noise reducing headphones for classroom, computer lab, library,
and listening center applications.
3068AV 2924AVPS
For younger students.
2810-BE 2810-PA 2810-TI
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