Universal 3.5mm Jack Bluetooth Car Kit Hands free - Bluetooth Hot Spot - SSS Corp.

AirFly Bluetooth transmitter

Car Stereo Bluetooth Single DIN LCD Audio Radio W/Brightness Adjustment APP Control MP3 Player Supports Hands Free Calling Am/FM Radio Aux Input TF/EQ/USB Fast - China Car Multimedia, Car Stereo

Audison B-CON Hi-Res Bluetooth Receiver - BCON

Scosche Bluetooth Aux

UGREEN Bluetooth Aux Adapter Wireless Car Bluetooth Receiver USB to 3.5mm Jack Audio Music Mic Handsfree Adapter for Car Speaker - In1mall

Touchscreen Bluetooth Car Stereo CD/DVD + Kit for 1988-94 GM SUV/Full Size Truck

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Aluratek's Bluetooth Audio Receiver with Built-in Microphone is a fantastic way to stream music wirelessly from your computer, smartphone, or tablet to any audio device with an AUX IN (3.5 mm) port such as speaker docks, stereos and car stereos. The small cylindrical unit, about the size of a AA battery will Bluetooth enable any speaker or receiver with crystal clear results.

Aluratek (aism01f) Bluetooth Audio Receiver with Built-In Microphone

To add Bluetooth to your old car's factory radio the easy way, go through the CD changer input

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Hosa IBT 402 Drive Universal Bluetooth interface kit at Crutchfield

Why don't all USB C to 3.5mm headphone jack converters work for all phones? - Quora

Car Stereo Bluetooth Single DIN LCD Audio Radio W/Brightness Adjustment APP Control MP3 Player Supports Hands Free Calling Am/FM Radio Aux Input TF/EQ/USB Fast - China Car Multimedia, Car Stereo