I've noticed that there are two types of wireless headphones / headsets / earbuds on the market – bluetooth and 2.4 GHz wireless (via proprietary dongles). Good example of headset that has both – bluetooth and 2.4 GHz connectivity are newly made Sony Inzone H7 and H9 models.
If I understand it correctly, bluetooth headphones use an encrypted protocol which complicates eavesdropping by strangers.
But when it comes to 2.4 GHz wireless headphones they are operating like radio and have no encryption at all? On top of that they often have much longer distance range (100m and further). Does it actually mean that anyone in that huge range can listen to the user's phone calls, hear youtube clips that user is watching etc (occasionally by interfering the same frequency or by doing it on purpose)?
I'm assuming this because I've had Sony MDR-RF895RK wireless headphones that I was using with my TV. And while I was watching TV, there were cases when I was able to hear dialogues of people who use walkie-talkies as well as audio from TVs of my neighbours. Which is quite scary, cause my phone calls can be exposed the same way.
I'm not sure if Inzone headsets (H7 and H9) mentioned above work the same way as Sony MDR-RF895RK that I have experience with, but I found out that they use a Sony Group USB Transceiver YY2965 FCC ID AK8YY2965 dongle. And so far I didn't manage to find any specification of encryption being implemented with this dongle.