The Shimano E Tube Di2 System Check and Programmer gives you the ability to precisely program the shifting of your Shimano Di2 drivetrain. Simply download Shimano's E Tube software, plug in the E Tube Di2 System Check and Programmer to your computer and Di2 drivetrain, and install the USB driver. Now you're ready to customize your gear shifting, check previous gear configurations, and update the firmware of your entire groupset. Compatible with the Di2 6770 and 9070 groupsets, the system allows you to customize shifting operations, such as switch shift functions, fine tune the rear derailleur position, and engage Multishift for the rear derailleur. Plus, you can check for issues between components, then update them accordingly to fix errors arising from outdated firmware settings. Note that the E Tube Di2 System Check and Programmer gives you a user name, password, and access to Shimano's E Tube Project software.