Amazon.com: MAEDHAWK Aux to Bluetooth Receiver for Car, Bluetooth Aux Adapter with USB to 3.5mm Audio Jack kit BT5.1 for Car Stereo Home Speakers Music Streaming Hands-Free Calling, A2DP : Electronics
Phone connector (audio) - Wikipedia
Amazon.com: UGREEN Aux to Bluetooth 5.3 Adapter 3.5mm Bluetooth Receiver for Car USB 2.0 to 3.5mm Jack Kit with Built-in Microphone Aux Input for Hands-Free Calls Compatible with Car Speaker and Home
Fun Generation BT Receiver – Thomann United States
Bluetooth 5.0 Audio Receiver Adapter NFC - Audio Signal Converters | Audio-Video Products | StarTech.com
BTM-S06R | Bluetooth Microphone Voice Receiver with 6.3mm Mono Male Plug | Abtus Singapore Pte Ltd | AV-iQ
Jack 6.5 6.35mm Male Plug To 3.5mm Female Connector Headphone Amplifier Audio Adapter Microphone AUX 6.3 3.5 Mm Converter - AliExpress
JOYROOM bluetooth FM transmitter 3.5mm jack aljzat (v5.3, 30
M6 PRO Wired + Wireless In Ear Monitors Bundle | MEE
Amazon.com: UrbanX Mini Bluetooth Receiver for Samsung Galaxy Mega 6.3 I9200 - Wireless to 3.5mm Jack Hands-Free Car Kit 3.5mm Audio Jack w/LED Button Indicator for Audio Stereo System Headphone Speaker :
Bluetooth receiver recommendations : r/livesound
Flight Tiny6 Portable Maple Mini Amplifier – Flight Ukuleles