The bluetooth thing in the bars seems pointless but as above; it's how I've got my bar-end junction bike set up.
For those with fully hidden cables (i.e. passing inside the stem / headset) I would suggest putting the bluetooth junction somewhere in the stem or just behind the bars to make it easier to disconnect the entire handlebar setup in one go.
@atz started
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The bluetooth thing in the bars seems pointless but as above; it's how I've got my bar-end junction bike set up.