Vista 2 earbuds are designed to offer distinct audio listening experiences with two different modes - Open & Closed.
In Open Mode you can listen to your music and at the same time clearly perceive sounds of your environment without having to remove your Vista’s 2 earbuds or interrupt your activity.
In Closed mode* you can submerge to the music or deeply concentrate in an activity with greater isolation from ambient sounds.
*Also known as ANC (Active Noise Cancelation)
To enable Open or Closed Mode follow the steps below:
Place both earbuds in your ears.
Double tap on one of the earbuds to activate either Open or Closed mode.
A short tone will signal the mode switch.
Double tap again at any time on either earbud to switch between the modes.
See, also HOW CAN I HEAR MY SURROUNDINGS BETTER?.