Rim Brake Dual Control Lever (Wired)
The Ultegra R8150 Rim Brake levers weigh about 295 g for a pair of levers.
They're essentially the same as the previous generation Ultegra levers, except for the fact that they'll work with the 12-speed derailleurs - using the SD300 port type.
Unfortunately, this also means that these 12-speed rim brake Di2 levers are not wireless. You can only connect them to a Di2 system using EW-SD300 wires.
12-speed rim brake shift levers have two SD300 ports and one satellite shifter (SW-RS801-T/SW-RS801-S) port.
Details & Specifications
E-Tube Port type:
Ultegra R8100 (Road)