Earphones remove noise, but let’s you hear what you need to hear
 

KingJim Japan introduces a set of noise cancelling earphones, without letting the user forget their surroundings. The convenience of noise cancellers comes from their capability to erase your surroundings while listening to digital media. However, this also means that you don’t get to hear other things around you when you need to hear them. The [...]

http://vr-zone.com/articles/earphone...hear-need-hear