With Shimano's SC-M9051 display unit it is easier than ever to keep track of your every move on the trail and insure your Di2 system is exactly where you want it for the trail aheadWith a quick glance you can monitor your Di2 data such as battery life, gear selection and shift modeWith the ever expanding E-tube platform the display also allows you to view your Fox suspension position, whether you are in climb, trail or descend mode you will always be prepared for the trail aheadCustomized Synchro-shift modes can be selected between S1, S2 and Manual on the fly by using the mode buttonCan be connected wirelessly enabling adjusting of the multi-shift speed and SYNCHRO SHIFT operation via computer, tablet or smart phoneAudible shift notification tone when in Synchro-shift mode, alerting you the front derailleur is about to shiftEasy access adjustment mode button means fine tuning front and rear derailleurs becomes effortlessReplaces Junction A function with internal battery charging portComes with 3 E-tube wiring portsCompatible with 35mm and 31.8mm handlebar diameters