A minitor is a small device that helps firefighters and other emergency responders stay in touch with each other. It looks like a small radio that clips onto a firefighter's gear or belt. When someone needs to talk to the firefighter or send them a message, they can do it through the minitor.
Think of it like a walkie-talkie, but much more advanced. Instead of just being able to talk, the minitor can also receive typed messages, like text messages on a phone. This is really helpful when it's loud or hard to hear, because the firefighter can read the message if they can't hear what the other person is saying.
The minitor is also really tough, so it can survive being dropped or banged around while the firefighter is working. It's also designed to work in very hot or very cold environments, so it's always there when firefighters need it.