Rose electronics CrystalView DVI Plus Installation And Operation Manual page 5

LASER SAFETY
Laser Safety Precautions
The CrystalView DVI Plus models can be operated in a non-restricted area
and requires no laser warning labeling. The optical transceivers used in all
models have a typical output power of approximately 5 mW. This
corresponds to Hazard Class 1M as per EN 60825-2 (safety of optical fiber
communications systems).
As a safety precaution, the laser ports on all models will be switched off if the
fiber plugs are removed the sockets. Even with this safety precaution you
should never view directly into the fiber connectors.