Yuck.... 27mhz. Go look up the FCC white papers on the unit. It's sitting in between the CB channel of 14 and 15(or something similar). Got a neighbor running a high powered CB, and you can give it up! Been there and done that with a MS mouse. I will never buy another 27mhz wireless device. And I thought my friend was crazy when he said he could NEVER get his wireless mouse to work, he lived a block from the interstate.....hmmm...wonder if there a few CB'ers on the interstate???