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MTB-Idle-
hippy is correct - for r8070 series, the EW111 thing does do that but also more usefully lets you control the Edge - things like changing screen, starting and stopping activities, flicking straight to a certain screen - and also light circuits as well, using combinations of button presses on the hood top extra buttons, and also changing shifting modes and other stuff using the Edge controls. Very useful.
On R8170 all that also works, but through the already-wireless function of the shifters.
theflatboy
If you have the wireless EW111 thing, right?
I only used it once for debugging. I'm far more likely to simply carry the charger around than worry about charge (as evidenced by the number of times I've just let it go flat)