It's generally just TV presenters who face a camera and are given instructions in their ear. But now it seems that teachers are doing the same thing.
It's all part of a scheme to monitor how they're doing and feed back to other teachers.
Tom Sheldrick reports.
The technology is called Iris Connect and used by thirty-eight schools around Wales.
Another bit of kit allows teachers to film themselves - to track their lessons on their own - or review with others later.