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Shimano
Di2 EW-WU111 In-Line Wireless Transmitter

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MSRP:$92.99
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Black Box.

Things just got easier with the Shimano Di2 EW-WU111 In-Line Wireless Transmitter, boosting the usability of your Di2 Drivetrain by adding Bluetooth connectivity. Customize your drivetrain or update your firmware while in the saddle with your compatible smartphone or tablet.

The tiny wireless transmitter plugs directly into your Shimano E-Tube Di2 wire, feeding the data through to your phone or tablet through Bluetooth, allowing you to make changes to your drivetrain, or monitor metrics like gearing or battery life. No longer do you need to assume an awkward position to get a rough estimate of your remaining battery life, then do some mental arithmetic to decide if you've got enough juice to get home.

The Shimano Di2 EW-WU111 In-Line Wireless Unit is compatible with Shimano's E-Tube Di2 systems.

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Nice to have if you need to access DI2 on your phone
by DLinLV
Competitive Racer
Las Vegas

I setup my DI2 on my PC, but you can do it on your phone now with this and the new battery. I noticed battery life has gone down a lot so I am now only planning to use this if I have any adjustments to do on the ride. Nice thing is if you have issues with the DI2 on a ride, you can access the system with your phone to make adjustments if needed, or get out of limp home mode. But, its not an essential piece of gear for DI2, in my view, so 4 stars.

Reviewed 5/12/2017
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Cheapest way to get wireless capability for Di2
by  Brian Kesselnan
Portland

Super small and light, works great inside my carbon frame. Not sure on metal frames. You will need the new battery and a short E-TUBE cable, but the wireless app is great as is the ability for the Di2 to talk to my Garmin.

Reviewed 8/31/2017
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