The Navigation Dial: Locations, Missions, and Settings Video

You can't change the volume on the Prowler Bot. You may have to adjust the sound on the Repulsor Gear to find an appropriate volume that will allow you to hear and respond to both pieces of Gear.

After connecting your Repulsor Gear with the Power Activator and accepting your first mission from Iron Man, you'll be able to access your settings to change the volume on the Repulsor Gear.