Momentum True Wireless let in the sound from the surroundings when you need it, so you can have them in your ears all the time.
The nice thing with in-ear headphones is that they effectively block outside noise, without the need for any active noise cancellation.
the Downside is that you have to remove them every time you talk to someone.
the Sennheiser has the answer with its totally wireless stoppers Momentum True Wireless.
With the help of a feature called Transparent Hearing function captures a microphone up sound and sends it into the ears, so that you can hear what's happening in the environment.
in Addition, the promise Sennheiser brilliant sound quality, and headphones supports both aptX and AAC-ljudkodekarna to sound better with the wireless transfer via Bluetooth.