TWSquare - Turns your Detachable earbuds to be True Wireless on BackerClub
Shure TW1 Review: True Wireless Secure Fit Adapter
Fiio UTWS1 True Wireless Bluetooth Module Detachable earhook for FH7/FA7/F9 pro MMCX/0.78mm Earphone aptX/AAC/SBC MIC waterproof|Earphone Accessories| - AliExpress