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A bit of a look online says I'd use 1gb per day using my phone, that's too much.

https://www.aliexpress.com/item/Mpow-Bluetooth-Transmitter-Receiver-3-5mm-Audio-Cable-2-in-1-Wireless-Adapter-for-Headphone-Speaker/32750719876.html?spm=2114.01010208.3.25.XjEwAE&ws_ab_test=searchweb0...

I thought I may be able to get some kind of transmitter or receiver there's a few on the net but I'm not sure which one to get or if it will work.
Might be easier to change to a Bluetooth head unit....

Wireless headphones. Bluetooth headphones I guess.

How can I connect these to a car radio?
Sounds silly, but I'm in a tractor off road so it's ok. It's not a Bluetooth stereo but is there still a way?
It's not all that loud in the cab but I do wear...