Dual Control Lever
These Ultegra ST-6770 Di2 dual control levers allow you to shift and use the brakes. They weigh 160g each. Although they are part of the 6770 10-speed series, you can also use them to shift any other Di2 series derailleur. This means that if you have an older Di2 bike that you want to upgrade to a newer (rim brake) Di2 series, you can keep your shift levers.
Each shifter has two e-Tube ports each and no dedicated sprint shifter port. The SW-R610 sprint shifters will not work with these levers.