Shimano di2 pce1 pc interface devicee tube di2 pc interface is required for quick and easy problem solving via your pc the pc interface simply plugs into any part of the electrical system and can test each component diagnosing the cause of any problems on your pc featurescan also be used to carry out firmware updates via the e tube software on your pccan be linked to the e tube software to change shifting settings like shift speed and multi shift optionsfor use with e tube di2 systemsa 2 year