I use white noise generators they are good but I want to use nature sounds so I'll need to use my mp3 player. The beauty of the WNGs is they are a thin tube, can still hear everything around me. Can anyone please recommend some earphones that are similar? Shame u can't plug an mp3 player into the WNGs and pass the audio through. Anyone I can't find open back earphones anywhere only headphones, do they exist? Thanks