BT Headphones but Hifi Has no BT. How to?

[photoshop]

Hi Guys,

Looking to invest in some BT wireless headphones to use around the home. I have a Onkyo MIDI system with some Sony speakers hooked upto my PC. Now its got various connections with 2 phono analogue outs with 3 inputs and OPTICAL In and a headphone out.

How can i add BT to it so i can still play music via my PC to it and it sends it to my wireless BT headphone?

 

[photoshop]

Thanks guys. Any recommendations for a descent BT transmitter? Dont want to spend an arm and a leg....

 

[photoshop]

EDIT: August MR260 Bluetooth aptX Low Latency Receiver and Transmitter in Black for £25 worth it?