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Shimano's Universal Di2 SM-BCR1 Battery Charger gives your system the power it will need to pump on.
With Shimano's revolutionary shifting option you're given increased accuracy, superior and enhanced smoothness and the reliability of electronic shifting makes gear changes faster and virtually eliminates missed shifts, but it can't be possible without the Universal Di2 SM-BCR1 Battery Charger.
Note: This is the battery charger only. You must purchase battery and power cable to complete the system.