Built-in Shimano Di2 EW-WU111 wireless improves the system's ease of use by adding Bluetooth connectivity in addition to ANT+ portability for pairing with an even wider range of devices. Combined with the Shimano E-Tube Project Wireless app, the Inline Wireless Unit allows drivetrain tuning and firmware updates directly from your smartphone or other device equipped with Bluetooth.

This miniature component is like a black box for your bike: it transmits data from the switches to your phone or tablet so you can track transmission performance such as transmission and battery life. The latter is especially useful as it seems that this is the most effective way that the industry has come up with to guarantee that you won't unexpectedly run out of juice during your trip home. It also measures overall riding performance so you don't sacrifice the functionality of a regular computer adding transmission information to your cockpit. Your pedaling will also be broadcast on television.

Integrated wireless Di2 EW-WUllll is compatible with Shimano E-tube Di2 systems. In addition to the Bluetooth connection, it transmits the signal via ANT+ to Shimano's own PRO computer , as well as to other head units equipped with ANT+.