• Is the Bluetooth just for doing firmware updates etc? It’s not functional during the actual riding of the bike (unless I want to use the secret buttons on top to move between screens on my Garmin)?

  • The secret buttons are great, plus battery warnings, gear selection (interesting but pointless).

    The setup above appears to have two Bluetooth transmitters though which seems a bit OTT.

  • the BT-DN110 is the battery... it is needed for BT as far as I know but doesn't actually transmit bluetooth.

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