Shuoer S12 on Fiio UTWS5 w/mmcx to 2 pin adapter : r/headphones
FIIO UTWS5 Bluetooth 5.2 Receiver for Earphones QCC5141 AK4332 aptX Adaptive MMCX - Audiophonics
MEE audio - BTX2 Bluetooth 5.0 Wireless Universal MMCX Adapter, aptX , Low Latency, up to 8.5 hrs Battery Life and Sweat-Proof (IPX5) - Black: Amazon.co.uk: Electronics & Photo
Talent H1-BT Bluetooth Adapter Cable for MMCX In-Ear Monitor IEM Earphone Headphones
Amazon.com: MEE audio BTX2 Bluetooth Wireless MMCX Adapter Cable with aptX & aptX Low Latency, Microphone & Remote, Bluetooth 5.0, IPX5 Sweat Resistance, Black (BTX2-BK) : Electronics
iFi Go Pod Review: A Superb Bluetooth Adapter For Your Favorite IEMs! - HIFI Trends