Bluetooth® Transmitter Receiver, Connection input: 1x AUX, Connection output: 1x AUX, SBC, Up to 1 Device, Maximum battery play time: 6 hrs

GTMEDIA A2 Mini Bluetooth v5.1 Receiver & Transmitter Adapter for Audio 2-in -1

NFC 80m Bluetooth Transmitter 5.0 With Bypass, AptX LL HD, SPDIF, AUX, And 3.5mm Audio Receiver For TV Pairing And Wireless Headphones For Tv From Ihammi, $23.71

Bluetooth® Transmitter Receiver, Connection input: 1x AUX / 1x SPDIF, Connection output: 1x AUX / 1x SPDIF, AptX ™ Low latency / AptX™ / SBC, Up to 2 Devices, Maximum battery play time: 22 hrs

Bluetooth® Transmitter, Connection input: 2x 3.5 mm Male, SBC, Up to 1 Device, 5 hrs, Automatic power off function

WB5 2 in 1 Bluetooth 5.0 Transmitter Receiver TV PC Car Speaker 3.5mm AUX Audio Adapter Wholesale

Bluetooth® Transmitter Receiver, Connection input: 1x AUX, Connection output: 1x AUX, SBC, Up to 1 Device, Maximum battery play time: 6 hrs

If you don't want to replace your vintage stereo receiver/old TV for now, but want them to have convenient Bluetooth capability, you should try this cost-effective Bluetooth audio adapter. This Bluetooth transmitter & receiver can add Bluetooth functionality to your device, allowing you to enjoy wireless audio on devices that previously did not support Bluetooth, such as vintage stereo, speakers, TV, PC, or car stereo. Free from the cable.

Bluetooth Transmitter Receiver - Bluetooth 5.0 Audio Receiver with Display, Wireless Audio Adapter for Home Stereo/Headphones/Speakers/Home Theater/TV

Aptx Audio Bluetooth Receiver Transmitter - Bluetooth 5.0 Audio Transmitter - Aliexpress

Bluetooth 5.0 Transmitter and Receiver, 3-in-1 Wireless Bluetooth Adapter,Bluetooth Audio Adapter with 3.5mm AUX Stereo Output for TV,PC,car, Headset,Headphone,Earbud Home Stereo System (black1) : Electronics