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Yeah, an EW-WU111. It's an inline doodad and talked Di2 to Garmin.
I bought one for diagnostics a few months back. Maybe @Titch or someone wants it? Can't see myself using it again any time soon.
My understanding is that you need the Bluetooth inline junction box to enable Bluetooth connectivity on 11 speed Di2 systems (it comes as standard on 12 speed). I looked into this a while ago and it's hard to find decent documentation to explain what you need, so hopefully someone else on here has done it already and can explain.