So far, I can only express praise for the device. Has always funkioniert (plug and play) and has also "runterschmeissen" tolerated by the table. My proximity to the PC from the couch is about 5 feet. The receipient is plugged behind the computer. Further, the distance should not be.
Consumption is good. I run the keyboard with two AA batteries. The keyboard has a Abschlaltautomatik and jumping with tapping the mouse button again.
The keyboard has the great advantage of a full keypad. Thus, writing something longer text is no problem.
... Tom