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I think for the Garmin, the Bluetooth unit.
It's annoying wahoo isn't supported. Or at least I've not worked the same out.
Bossman-
It works on my wahoo (ultegra shifters). I change screens with one of the top buttons. I have the inline wireless unit although it's actually in the handlebar end on it's own cable from the shifter. Figured there was no point in adding a junction that could potentially fail, hidden inside the frame.
cjr
I was wondering about this. My new GRX shifters have got the two new buttons. Do I need another piece of hardware to make them work?
What do people mainly use them for - shifting garmin screens seems the obivous one.