-LSB-...] learn at an even younger age since infants can hear outside sounds while still in the womb. (greenchildmagazine.com)
Using a very clever design they let outside sound in and mix your music in a way that lets you catch conversations and know what's going on around you. (digitaltrends.com)
While listening to your chosen podcasts on the move, being social with others is among the least of your concerns, especially with headphones blocking outside sound. (androidcentral.com)