Seems pointless and inconvenient for me as they usually seem to be poor quality, and can you really listen to music in the shower, and are you showering long enough to benefit from it?
Or do you own one and use for a different purpose, like swimming or Kayaking?
OP didn’t say listening to music is pointless. Try rereading the post.
Literal first 2 words of the post. Have you checked your CO detectors recently?