All wireless headphones will have some kind of hissing or static noises. Not the best idea for listening to music but it's ok.

Cheaper models have horrible background noises. Good ones will cost around ~50 and the hissing and static noises are to a minimum. I never tried the expensive ~150 ones before. Just remember that it's not going to be as loud as regular wired headphones and if you do make the volume louder, theres going to be a lot of static.
I have sein rs120 a...