The projector has integrated speakers.
However, you can also connect your stereo system etc. via the audio output.
We always connect the laptop via HDMI and pair our Bluetooth box with it.
A separate receiver is required for this, then it will work. However, I would not recommend this projector for home cinema. The fan is loud and the quality of the projection is not convincing. I sent the projector back after a short test.
for the price, i think it's good. the volume isn't the best, but when it's connected to speakers, it's enough for me.
the picture is sharp and you can adjust it well for your individual needs. i also connected the nintendo switch and played via the projector. the picture was always great.