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@Brommers
One of the advantages of Di2 is the ability to run satellite shifters, including the climbing shifters mounted on the top of the bars, as seen here in Dammit's photo. However, they're a bit fugly in my eyes, the cable comes out of the LHS of the box, despite needing to go over to the right, and the buttons seem to me to be the wrong way round.
If you take the box apart, you end up with another small box of potted electronics like this:
Ignore the three coloured wires - they're a later addition, courtesy once again of my tame electron herder's soldering skills:
I've soldered the flying leads onto two small tactile buttons designed for PCB mounting and, using some spare handlebars wrapped in tape, I've encased them in PU sealant. This serves two purposes - firstly, it keeps them in place, and secondly it provides a ridge around the buttons to prevent the bar tape from activating them even if it's wrapped tightly. I hope it does anyway.
The PU sealant is busy hardening while I ignore the more important jobs to do before tomorrow's bike fitting...