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Kimmo
There is a Bluetooth dongle which you need to place somehwere in the system, thought better shifting had covered this.
This is the doodad https://www.chainreactioncycles.com/p/shimano-ew-jc200-di2-e-tube-2-port-junction?kk=a4c6295-18a9d40f7ad-340433&msclkid=585b2476f0791abfc803417380a7f9ad&utm_source=kelkoouk&utm_medium=cpc&utm_campaign=kelkooclick&utm_term=Shimano+EW-JC200+Di2+E-Tube+2+Port+Junct
Make sure it sits somehwere close to the surface of the frame or bars to get a good signal.
Think it’s pretty agnostic as to where in the system it actually sits