Varia™ RCT715 has rearview radar that provides visual and audible alerts for vehicles approaching from behind up to 140 metres away.

The rear bike light with integrated camera records what’s behind you at up to 1080p/30 fps. So you can ride with peace of mind, knowing you’ll capture clear footage if anything out of the ordinary is detected.
 
Alert motorists to your presence as soon as possible with daylight visibility up to 1 mile.

It can detect if an incident occurs and automatically saves footage before, during and after the event.
 
Pair and control the built-in camera with your Edge® bike computer or compatible smartphone as well as selected Garmin wearables.
 
Easily mount this sleek, compact device on the seatpost of almost any bicycle. The vertical design allows for leg clearance and a perfectly comfortable ride.

Stay powered for your longer rides with up to 4 hours of battery life with radar and tail light on solid high or night flash, 5 hours on solid low and and 6 hours on day flash — all with camera recording at 1080p.
 
See more details here
https://www.garmin.com/en-GB/p/721258/pn/010-02476-00
 
PART NUMBER010-02476-00