Shimano BT-DN300 Built-In DI2 Battery - For Dura-Ace 9250 Ultegra R8150 Systems Compatible SD300 Wires Model=Akita Series Cable Locks Left shifter has a trim

Left shifter has a trim position when front derailleur is in the large chainring

Features Shimano HG-EV technology for gear combination and cadence management

Small flange protects hands without interfering with handlebar components

One-piece caliper is CNC machined from high-grade 2014-T6 aluminum for rigidity and weight savings

Shimano BT-DN300 Built-In DI2 Battery - For Dura-Ace 9250 Ultegra R8150 Systems Compatible SD300 Wires Model=Akita Series Cable Locks Left shifter has a trimShimano BT DN300 Built In DI2 Battery For Dura Ace 9250 and Ultegra R8150 Systems Compatible with SD300 Wires. Shimano Di2 Batteries. Must purchase battery charger and power cable to complete the system. All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e tubeproject. shimano. com