手持ちのヘッドホンに合わなかったので手放します。

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Headphone Adapter

Slim straight 3.5mm Stereo Headphone Adapter

USB-C Type C to 3.5mm Aux Audio Active DAC Headphone Adapter Cable For – Magconn

U Shaped Adapter, Dual 3.5 Female to Single TRRS Male

Headset adapter with headphone/mic plugs - Audio Cables and Adapters | StarTech.com

iFi Headphone Adapter | 3.5mm to 4.4mm Adapter

Amazon.com: MillSO Headset Adapter (3.3 Feet) 3.5mm Audio Jack Y Cable Headphone Adapter 3.3 feet 1x 3.5mm Female to 2X 3.5mm Male Headset Adapter ...

4-Conductor 3.5mm Splitter Adapter for Mic and Headphone

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USB-C Headphone Adapter, Type-C Charger Port 3.5mm Jack Earphone - ACG27

Headphone Adapter

Eletech ProAdapt Pigtail | Headphone Adapters - Socrates 2.5mm to 3.5mm

UGREEN Lightning to 3.5mm Adapter Apple MFi Certified