Shimano 105 RD-R7150 Di2 Rear Derailleur - 12-Speed For 2x12 Speed Direct Mount Black

Low-profile Shimano Shadow RD design reduces damage from contact and falls Receive the wireless shifting signal from the shift lever Check the battery level and Bluetooth/ANT pairing success with your cycle computer/smartphone/tablet Allows selection of preferred shift mode and view adjustment mode information (if you wish to tweak or tune your rear derailleur) Smartphone/tablet connectivity via E-TUBE PROJECT