The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion & stretching, but provides effortless gear shifts This junction A is required to connect the shifters via E-tube wires to the down tube junction wire 3-port design, one for down tube wire to bottom bracket junction, two for shifter connection Battery level indicator feature E-tube EW-SD50 wires not included Additional charging point when using internal battery Gear index setup switch to allow fine tuning via shifter buttons Reliable & secure water resistant connectors Stem mounting strap included