Shimano SM-PCE02-B3 Di2 PC Linkage Device for E-Tube Description: The Shimano PC Linkage Device for STEPS and Di2 groups is used to check system functions, connections, and errors, as well as update firmware and customize functions. Features: SM-PCE02 connects to personal computers using Micro USB cable connection Improved quality of communication against noise Error check function assesses connected unit operation and identifies errors Specifications: Compatibility: Shimano Di2 Shifters/Derailleurs and E-Tube Project desktop software