> Where in the world do you live

I’m in New Zealand. I ride in the road in town and out in the hills at the weekend.

The way I use it is to look down, see if a car is behind, then look behind before pulling out. I don’t bother looking back if there is a car close (the range must be around 100-150m I think?).

It also yells louder if the car is approaching fast. The integrated light changes how it flashes when it sees a car.

In group ride with talking etc, it’s helpful too as it usually doesn’t pick up bikes (unless the guy behind is an absolute unit) and the squawk of an approaching car is helpful for the group.

Electric cars and busses no longer sneak up on me, it’s great use of tech on a bike.

https://www.garmin.com/en-US/p/698001/

Ugh, I lived in Dunedin for a year, and it's the worst place I've cycled by a considerable margin. Much worse than e.g. Ireland or England, which also isn't exactly bicycle-friendly. The infrastructure isn't even half-bad, but the behaviour of motorists was just the worst. Kiwis are like that old Goofy cartoon where he's all nice and friendly until he gets in his car, after which he becomes a raging maniac.

So yeah, with "New Zealand" as context a device like that makes more sense.