Thank you for viewing. I have only used it for listening, and haven't used it since. It's a clear-design, detachable monitor-type in-ear earphone. The manufacturer is unknown, but it's a canal-type monitor earphone, so it's stable. Since there are many unknowns, I'm offering it at a low price. If you're not particularly concerned about the brand and are looking for a clear-design canal-type monitor earphone, please consider it. Thank you for your consideration.