The flashing lights on the Firefly can actually be synced across all devices without having to adjust them one by one.
Simply double-click on any one of the device's power buttons and all the bike lights and even the helmet (if it's paired) will sync.
Flash patterns received via sync are not saved on the device permanently. When you turn off your devices, synced flash patterns will be lost. It simply serves as a quick way to get all devices synced in flash.
Hazard lights will follow the hazard light flash pattern specifically of the "sender". (They do not sync with the flash pattern of the red LED ring light).
You can also activate the Flash Sync feature by double-clicking your helmet's power button, the flash patterns on your Firefly sync with your helmet based on the Profile assigned (i.e: a Firefly assigned to a Front Profile will sync with the flash pattern of the front light on your helmet only and not the rear light).
Syncing using the Firefly & Ultra: