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For the charging on internal SHIMANO DI2 batteries (BT-DN110), the SM-BCR2 also serves as a PC linkage device for E-TUBE PROJECT firmware updates and settings.
PRODUCT SPECIFICATIONS
MODEL NO SM-BCR2 SERIES DURA-ACE R9150 Series Remarks PC linkage device with limited function Compatible battery BT-DN110, BT-DN110-A Charging cord Including SM-BCR2 Compatible battery BT-DN110 BT-DN110-A