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the BT-DN110 is the battery... it is needed for BT as far as I know but doesn't actually transmit bluetooth.
atz-
But the RS910 bar end junction does, so the add-on BT D-Fly unit is pretty redundant.
Edit: RS910 only uses Bluetooth for config. EW111 required for data and buttons.
Edit 2: RS910 has no bluetooth built in. The references in the RS910 User Manual to turning on Bluetooth LE mode only works if you have a D-Fly/EW-WU111 unit connected to the system.
Brommers
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.