the pairing mode is for the light so it can't be controlled from any random device near you. On the other hand anybody can connect to the radar.
I have been using it in group rides where a person with a radar is always on the end of a peloton and other people are getting these notifications to their edge devices.
It is useful when you are riding with somebody slow (wife, kids) - he/she/it will be always on the back and in case you will loose him you will be notified about lost connection to radar :D