The ProDiver employs the latest Oris innovation: the Rotation Safety System (RSS). Oris has applied for a patent for this new development. Only when the outer bezel is lifted can the timer scale be released and the dive time set. Then, the bezel can be relocked to the case to ensure the timer cannot be moved accidentally.
![](https://i.ytimg.com/vi/F8bTPn9ya6I/mqdefault.jpg)