Amazon.com: Logitech Bluetooth Audio Adapter for Bluetooth Streaming : Electronics
Bluetooth 5.0 Transmitter Receiver for TV/PC, Evatronic AptX Low Latency Adapter with 3.5 mm RCA for Car/Home Music Streaming Stereo System, Pair with 2 Devices, Max 22hrs Worktime at One Charge
bluetooth-to-audio-adapters
JL Audio MBT-RX Marine-rated Bluetooth® adapter at Crutchfield
AirFly | Bluetooth transmitter connects wireless headphones to wired audio jacks
Mini Lavalier Type Bluetooth MP3 Player Portable HiFi Car Music Player With Card Slot .5 AUX Audio Sport Music - AliExpress
Amazon.com: Bluetooth Car Adapter, BAVNCO Mini Bluetooth 5.0 Stereo Transmitter Receiver Wireless 3.5mm Aux Jack Adapter Hands-Free Car Kit Built-in Mic for Car Aux, Home Stereo, Headphones, PC,TV and More : Electronics
Sony STR-DH190 Stereo receiver with Bluetooth® at Crutchfield