With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gearThe removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates, corrosion and stretching, and also provides effortless gear shiftsFull and semi synchronized shifting programable, Synchro shift compatible meaning a single shifter can control both front and rear shifting which can be fully custom tuned to your riding preferences. Semi synchronized shifting means when a front shift is made the rear mech will automatically correct to the appropriate ratioSimply pressing tactile buttons allows effortless and comfortable shifting even when your hands are coldDrop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STIProgrammable function of top button remote switch for third party cycle computersBrake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding on the hoodsFinely tuneable reach adjusters for the levers enable custom fitment for all handsLevers are supplied without electrical cables, as these need to be ordered separately to suitFor use with E-tube electric cablesComes complete with SLR brake cable set