there may be a chance to "tune" the keyboard to a different channel. I can train the keyboard, the mouse, the drawing pad and....to use other channels for communication. On the other hand, I actually tested just for fun the distance the keyboard is capable to send accurate signals, this was less than 30 yards.
The mouse, however, (it is a gyro type which can be used also as a handheld pointing device) had no problems to communicate at a much farther distance.
I took the keyboard and the mouse all around my house as well as in the neighbours house....no interference at all, I was just curious after your posting, but then....who knows.