Di2.pdf -

The Shimano Di2 electronic shifting system replaces traditional mechanical cables with electronic wires to deliver instant, consistent, and low-maintenance shifting. Key features include 12-speed synchronized shifting, customization via the E-Tube Project app, and robust waterproofing for varied weather conditions. For detailed technical specifications, refer to the official Shimano Road Di2 General Guide https://si.shimano.com/en/pdfs/dm/RAGN010/DM-RAGN010-02-ENG.pdf . Shimano XTR Di2 Groupset Review - Chain Reaction

When Shimano's Di2 electronic shifting hit the road bike scene in 2009 it was tagged by many as a solution to a problem that didn' Chain Reaction Cycles 10/11-speed Di2 beginner's guide to Di2 - BetterShifting di2.pdf