I want to connect my wireless headphones to my hifi but it doesn't have a 3.5 mm jack or a line out.

[David1967]

Can I get a USB Bluetooth transmitter to allow me to connect my hifi -present from my kids - that has no jack or line out. I have a pair of wireless headphones but can't connect them.
The hifi does receive Bluetooth.

 

[Alabalcho]

Even if your "HiFi" has USB connector, it is for "input" only - to plug a USB flash disk with MP3s to listen.

What is the exact make / model of your HiFi?