It does what Bluetooth headphones do but with regular headphones. More usefully, it is a Bluetooth line-output to plug into an amplifier which is what I am actually working on. This will go into an amplifier that can connect to my laptop and is integrated into my bedside laptop stand (I’m physically disabled so in bed most of the time). I’m working on making several parts of my laptop stand more modular. I want this to be removable to use elsewhere if I want and charged when not in use. It therefore has a use, a place of storage, and is always available.