Audible alert for Blind Spot is not a feature on the Subaru implementation of blind spot detection. I miss it dearly, too. The light is a lot more effective at night, but there are crazy people out there driving during the day, too. That audible alert in my previous vehicle saved my bacon a number of times on the I-95 corridor between SE PA and Washington DC over the 6 years prior to my retirement. When folks are crossing multiple lanes at very, very high speed, weaving in and out of traffic, it can almost be impossible to see them...or see the nice amber light...in time to avoid a collision sometimes.