To adjust the earbuds to SurroundSense follow the steps below:

1. Download and install the Jaybird App on your phone.
2. Open the Jaybird App on your phone.
3. Once you connect to the Jaybird app select SurroundSense mode located on the dashboard and navigate to Settings.
4. Adjust the strength as shown below.
   

Once you have adjusted the mode to your desired level you can enable SurroundSense on Vista 2 earbuds by follow the steps below:

1. Place both earbuds in your ears.
2. Double tap on one of the earbuds to activate SurroundSense.
3. A short tone will signal the mode switch.
4. Double tap again at any time on either earbud to switch between the modes either SurroundSense or ANC.

Also see What is SurroundSense and ANC mode? and How can I hear my surroundings better?.