I use a keyboard and mice, two different receiver devices yet they work just fine!
It's not bluetooth so being custom devices I guess they implemented some checks to make sure the frequencies are not in use or something, funny both are logitech. Using the old cordless desktop mx keyboard and the new g700 mouse. ^^
My other bluetooth mouse fails hard, even if being the only bluetooth unit, true I run it trough my build in receiver (my bluetooth one I got with it broke), I guess we need better specifications and routines to avoid crashing of frequencies, hmm... I think it's time for a ISO meeting!
(Funny how my year 2000 produced keyboard works fine without interference while my backup bluetooth mouse from 2008 fails hard. :P)