Amazon.com: KZ APTX HD CSR8675 Bluetooth 5.0 IPV5 Waterproof Noise Reduction Bluetooth Module Upgrade Cable for ZSX/ZSN/ZSNPRO/ZSNProX/ZS10PRO/AS12/AS16(C Pin) : Electronics
Bluetooth 5.0 Audio Module BT5.0 CSR8675 Chip Support APTX-HD Finished PA214# | eBay
Bluetooth Module - Heritage Audio BT 500 - BT 500 V2 - Vintage King