Volume limiting is the specification that matters, since a class set gets turned up by whoever wears it next and nobody is checking. Beyond that it is durability, because the failure point is almost always the cable at the jack rather than the drivers. Wired sets sidestep pairing entirely, which is worth more than it sounds when thirty devices are in one room. See volume limited models and the wider headphone range.

Childrens headphones on a bright learning desk with tablet, notebooks, pencils and classroom study supplies nearby.
Childrens Headphones for School and Learning

Shop childrens headphones for classrooms, home learning and digital activities. Practical options for young listeners.