More than you’d think!

• Yes, it alerts you of vehicles, even before you can hear them. This can be critical when riding in hilly, rural areas.
• It can detect multiple vehicles (even when you miss them through your mirror). Depending on how you’re device is set up, it can indicate the approach speed and give you a colour coded warning.
• It can be used to gather vehicle passing speed and count data.
• They flash when vehicles approach, increasing their speed and intensity to catch a driver’s attention. I’ve actually been told by drivers in passing that this feature works really well.
• they can warn you of unexpected vehicles, like ebikes, approaching quickly from behind when you wouldn’t expect them (like on a quiet trail).
• They can alert you when it may not be safe or ideal to check your mirror or shoulder check.

I have the varia 515, and it’s been an incredible safety tool. Even though I also ride with a mirror, the radar has been more useful/practical/accurate on certain roads.