ICE: Do you see that device on the wall that turns back and forth? \
That's a security camera.
ICE: If you get spotted by one the alarm will sound and enemies will converge on your location and sometimes nasty traps may trigger.
ICE: You can avoid getting spotted either by taking cover behind tall objects, you should avoid getting spotted as much as possible.
Cirno: Can I just freeze them?
ICE: Yes you can! They are very sensitive pieces of equipment so just shooting them will destroy them and no alarm will sound.
ICE: When you enter a room the camera should always be your highest priority.
ICE: If you get spotted and the alarm sounds, find an alarm box in order to disable it.
They're these rectangular flashy red boxes you may sometimes find of walls. \
Use one and the alarm goes away! Easy!