This is my first garmin edge 830. I notice there are no beeps (tone alerts) sound on the device, I tried to turn off & back on tone setting, I even try to change the sensor setting from single tone to multi tone, but I can not hear anything even in my room are dead quiet, until I put the device right next to my ear and I can barely hear it beeps, so what is the purpose of having the tone if I can’t even hear it beeps? I rely on my radar sensor to notify me when car is approaching from behind, without the tone, it basically unless. Does anyone have this same issue? Any advice. Thanks in advance.