Sram etap blipboxat the heart of your tt bikes sram etap sytem is the blipbox control module that is equipped with srams ownairea wireless communication protocol the four etap blip shifters plug into the blipbox which then processes all your shift commands in an instant featuresblipbox mount includedreplaces standard drop bar shift leverslimitless aero configurationsup to two positions per sidefits a standard garmin mount or the included mountcan also be used for shifting when riding in an