Make regular headphones "wireless". Much louder sound than from the headphone jack on the phone. Supports the best audio codecs over Bluetooth 5.0. Excellent sound on mobile calls if it is attached to the collar. USB-DAC.

You will never get rid of the cable from the headphones themselves, just free them from the cell phone. More expensive amplifiers have a more nuanced sound.

FiiO BTR3 is not a necessity, but makes life as a headphone lover a little more fun. Now I can take with me the pair that is my favorite at the moment, and use it in almost-wireless mode. Just hide the cable on the inside of the jacket or shirt. And...