No, you cannot use audio devices during the race.
As a USAT sanctioned race we are required to follow the posted rules of the USAT.
Per the USAT regulations any participant who at any time uses, wears or carries a headset, radio, headphones, personal audio device, or any other item described in Section 3.4(i) shall be assessed a variable time penalty. They are also subject to disqualification.
You can review the posted rules here:
https://www.teamusa.org/usa-triathlon/about/multisport/competitive-rules