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You need to add the little in line Bluetooth thing if it didn't come already installed.
Once it's installed you can add a di2 screen to your garmin which shows what gear you're in, battery levels etc. Can also use that to change shifting mode and other things. Kind of handy but I don't use it much tbh.
As well as using the buttons to move screens you can also set double click and long presses to do specific things eg start/stop the route, start a lap etc. Again sometimes useful to be able to do those things with both hands on the bars.
Overall I think its a useful addition, but the Bluetooth widget is expensive for what it is and it feels like it should be bundled with the system as standard instead of an add on
Momentum
frank9755
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.