For just about 16 years now, some variation of the Trijicon RMR red dot sight has set the durability and ruggedness standard for rifle and pistol optics. Not only did it not break, it remained on. And not only did it remain powered on, it maintained its zero perfectly. So, in my book, while anything electronic can fail, this particular setup falls into the extremely low probability of failure bucket. Do your part and make sure to proactively change the battery every New Year’s Day, and you’ll be good to go for a long, long time.