Interesting technology from New Zealand.
Another back up to reduce mistaken for game shootings, but certainly not to be relied on. I think it may be more valuable as a reminder to keep your muzzle in a safe direction with in your hunting group.
The most compelling argument against it's use is not all hunters will have the sensors needed to make it work. and non-hunters even more so. But, that was the argument used against hunter orange, and it has definitely reduce shooting related hunting accidents.