What for TRN BT20 Bluetooth Adapter ? #MMCX 2Pin#

Purchase Link： https://www.aliexpress.com/item/TRN-BT20-Bluetooth-Adapter-Earphone-with-MMCX-0-75mm-0-78mm-for-Shure-SE215-SE535-SE846/32957895723.html Technical Specifications: Product Name: TRN BT20 Bluetooth V5.0 Ear Hook Cable; Brand:TRN; Product model:BT20; Bluetooth Version: V5; Wireless music / talk time: About 6 hours; Battery capacity: 120mAh battery; Charging time: About 2 hours; Standby time: 180 hours; Bluetooth effective connection distance: About 10m; Cable interface: MMCX/2PIN connector; Voltage: 5V; Function: Voice control; Whether with microphone: Yes. DIY SE215 : https://www.aliexpress.com/item/Hi-FI-MMCX-SE215-stereo-Noise-Canceling-3-5MM-In-ear-Earphones-With-Separate-Cable-headset/32886004366.html TRN V80: https://www.aliexpress.com/store/product/TRN-V80-2DD-2BA-Hybrid-Earphone-Sport-Earphone-Noise-Isolating-Supreme-Sound-Headset-With-2PIN-Detachable/4368003_32893182455.html Tiandirenhe TD-R 3D Print MMCX HIFI Earphone : https://www.aliexpress.com/store/product/Tiandirenhe-TD-R-3D-Print-MMCX-in-Ear-HIFI-Earphone-Hybrid-technology-Custom-3D-printing-inverted/4368003_32970187233.html