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Shimano di2 ew90 junction a box 3 portsay goodbye to poor shifting control, thanks to the junction a box from shimano'. '.strtoupper('m')ounting seamlessly to your bike stem, thanks to the mounting strap included, it connects with e tube wires from d12 shifters and a downtube junction wire.featuresthis junction a is required to connect the shifters via e tube wires to the downtube junction wire3 port design, one for downtube wire to bottom bracket junction, two for shifter connectionbattery level indicator featuree tube ew sd50 wires not includedadditional charging point when using the internal batterygear index setup switch to allow fine tuning via shifter buttonsreliable and secure water resistant connectorsstem mounting strap includedcompatible systems e tubeweight 10g approx.part no sm ew90 aa 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.