have a look at https://www8.garmin.com/support/download_details.jsp?id=12819#Instruct
has now option for none-single and multi tone
but still barely hearable
is there any update on this? volume adjustment would solve problem. or ability to turn off the alert tone but still run the radar. the information is right in front of us on the screen. we dont need audible alerts going off constantly! Anyone i ride with wants to smash the thing. .