I'm afraid the inexpensive wireless mikes are very poor. Radio shlock used to have one that worked into any F.M. radio, but it was extremely unreliable. To get anything that might really work as the teacher moves around, you'd need to go with a professional mike, and they are over a hundred bucks. Also, the receivers for such mikes require a line input to the recorder and you'rs probably doesn't have that.
Take braille notes! Sorry Tom Fowle
