How do I stop my tactix 7 pro ballastic from announcing my heart rate while I am walking or running?

When I am using the walking or running app on my garmin watch, I listen to music by way of earbuds.  Every mile I get an update on the time per mile and my heart rate.  I wish to turn off the announcement of my heart rate.  If I do not have earbuds in, the watch still announces my heart rate.  How do I stop this from happening?

Thank you.