All the white boards I have seen use pulsed microwave technology simliar to DECT cordless phones to communicate between the pupils and teacher's pads and the projector control computer. They fill the classroom with pulsing microwaves. Terrible technology.

Alasdair
(Powerwatch)

"Another possible culprit could be a classroom whiteboard. There is anecdotal evidence that these new gadgets are giving both teachers and pupils headaches, particularly if health and safety guidelines aren't observed and people find themselves staring straight into the projector beam. Check that this is not happening."

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It seem there are white boards and white boards.

Ones which just have a ceiling mounted projector driven from a wired in laptop (or PC) on the teacher's desk seem to be OK.

The problem apparently come with the ones that have interactive input drawing and typing pads that can be passed around to various pupils for them to add drawing, comments, etc, to also be shown on the white board. These always weems to be wLAN connected (maybe some are Bluetooth) using ulsing microwaves to and from the pupil's pads to the main system. It was one of those that I measure a few years ago on the DfES stand at an exhibition.

Alasdair