Dual Control Lever
A set of ST-6870 Dual Control Levers weighs about 300g for a pair and both of them are equipped with two e-Tube ports and a remote sprinter shifter port.
These previous generation Di2 levers are suitable for rim brakes and possibly mechanical disc brakes. The brake lever clamp band supports 23.8 - 24.2 mm diameter bars (standard road drops).
These 6870 levers do not have a button on top of the hoods.