Doppler smart earbuds blend music with the outside world
 

Doppler Labs raised eyebrows with its Here Active Listening earbuds, which could amplify or tune out frequencies depending on how much you wanted to hear the outside world. Well, it's back with an upgrade, the Here One -- and it offers even more cont...

https://www.engadget.com/2016/06/28/...smart-earbuds/