Connected to an old laptop in order to be able to connect wireless headphones, the job was done but the headphones were producing an indistinct noise, like parasites. I don't know if it has to do with a specific frequency.

For this money, I didn't have high expectations but I didn't expect the sound quality to be so terrible (definitely the bitrate does NOT exceed 90kbps as I hear it) and not all frequencies are transmitted (mainly the low end but also the high ones) and all this at a distance of less than half a meter.