Audio output vs. headphone.

Actually their support advised to return the device to the store to take another one. I did only 1/2 of that.
Unfortunately that looks to be the only device with the features I want on the market.

Sounds like everything works except the Aluratek module, seems like it’s the culprit.

Thank you for your advice. I will clarify.1) I use the same blue-tooth on the same PC with a USB blue-tooth dongle and it is loud enough.2) I use small Creative audio system with 3.5 jack on the same green socket and it is loud enough.3) I hear almost nothing once I plug-in the Aluratek device.4) I guess that altogether is because the Creative has an amplifier inside and the headphone does have (if) only a limited amplifier.
... you may be right and there is no way to fix if. I was dreaming about adding some other small item between the green socket (OR USB port) and the Aluratek blue-tooth transmitter (many headphones connect to USB).-----------------------My actual desire was a bit different. I want to have two pairs of headphones connected to PC so that may watch a movie together with my wife.

If the volume is already maxed out on your Bluetooth headphones and the Bluetooth transmitter/your computer, then it won’t get any louder.

An awesome Bluetooth headphone:

https://www.audio-technica.com/en-ca/ath-dsr9bt

Above is the best Bluetooth headphone I’ve heard. Interesting tech, and many of ATs other BT headphones are great too.

If you only want to spend a little, go for Jabra or Jam Bluetooth headphones.

For sound problems on your computer, run the audio troubleshooter.