from the first moment of operation, a very long delay was observed in the transmission of sound in bluetooth headphones (about half a second), so it is unsuitable for listening to playing any musical instrument or watching a movie (unpleasant delay in relation to the image). Maybe just for radio, but all machines now have bluetooth so it's just a useless device. Before I know it, I've missed the return deadline and now I'm giving it away so it doesn't take up space. Too bad, because the sound is very high quality and its operation very easy.