Shimano EW-WU111 Wireless Unit Shimano's Wireless unit is asmall transmitter that allows pairing of your Di2system toBluetooth and ANT+ enabled devices.Itunlocks the fullpotential of your Di2 system, allowing itto wirelesslylink with your phone, tablet or compatible cycling computer.Paired with a head unit or cycling computer,the EW-WU111 will wirelesslyrelay critical information about your Di2 shifting system. Gear position, battery life and more will be available at a glance and keeping you in the know when it come to your electronic shift system. Paired with a Bluetooth-ready phone or tablet, you will be able to reprogram and perform system checks of your Di2 system on the flywith Shimano's E-Tube Project App, available for Android and Apple devices. We recommend the EW-WU111 to anyone looking to unlock the full potential of the Shimano Di2 system. Features E-tube Di2 D-FLY inline data transmission wireless unit Internal chip enables system wireless functionality of Bluetooth components andwireless connection to E-Tube Project mobilesoftware Allows information to be sent wirelessly via ANT+ private network to compatible cycle computers Information can be displayed and recordedabout gear position and ratio,derailleuradjustmentand Di2 battery level Clean integration and installation with E-tube system The Shimano TL-EW02 Di2 Wire Plug tool isrequired forconnecting orremoving E-tube Di2 wires Average weight 5 grams RequiresupdatedBT-DN110 internal seatpost batteryorBM-DN100 External Battery Mountfor proper Bluetoothfunctionality | Shimano Ew-Wu111 Wireless Unit 2 Ports