The electrical schematic was available for it. I bought a few to use for ad-hoc networking experiments but never got a chance to do any research with them. They had an earlier clunky rectangular model as well if I remember correctly. It was amazing, like seeing the future, and then everyone ignored it and it disappeared. I think I remember reading at the time that it had taken over a few schools and the teachers were bewildered by it.
I had one of these things! The mesh networking was so cool -- even just one or two other users would greatly expand your chat range.<p>I still am kind of disappointed that there's nothing like it today built-into smartphones.