Little more than that I've used other Garmin products in the past, to varying degrees of satisfaction. From what I'd read here in earlier posts I expect it to serve my modest needs. Even with hearing aids my hearing's not so good anymore so having something that provides a sense of what's coming up behind me (when I venture out onto the narrow bike lanes aside the two-lane paved highways when necessary) ought to provide a degree of safety I've been missing. I just got back 'into' biking a year ago in an area that's vastly different from what I'd experienced before moving here ten years ago. Topography's different, roads are different, there are more trucks here than cars, and fewer dedicated bike paths close by home.

​​​​​​​So I chose Trek's CB device over its competitors.