Everything needed to install and operate the new Dura-Ace DI2 system
-Wiring kits, batteries, adaptors and chargers sold separately
-The Shimano SM-BTR1 is a rechargeable 7.4 volt lithium-ion battery for the Dura-Ace Di2 and Ultegra Di2 component systems.
-Available for Pickup within 2 to 1 businesses days