A:Answer Thank you for your question. Both voice alerts and alert sounds will be heard when the volume is turned on, however, there are some settings you can adjust such as Quiet Drive and Auto Mute. For assistance, please feel free to contact us at 800-543-1608 or you can access the full owner's manual here: https://cdn.shopify.com/s/files/1/2203/2035/files/RAD480i_WEB_MANUAL_503c47a8-211c-46d0-a864-41613c41deb3.pdf?v=1602185877