Not noise/sound canceling

Goodbye $5
It just sorta makes more noise. The louder the outside noise the louder its noise gets on your headphones.
This is the bad air freshener of noise filters. It doesnt make it better but it will try and drown out everything else. Sadly it cant even do that very well. I found the sounds/noises it produces even more annoying than just ambient sounds.
Doesnt wast your money, buy a pair of active noise canceling headphones.

CreativeColor about SoundCurtain, v1.5