Think of the D1x as a shifter – similar to the mechanical shifter that’s on your handlebar right now – but programmable, flexible, and simple to adjust.The D1x Trail Shifting System is made up of 2 parts, the Shifter (the device that pulls cable) and the Remote (the controller that's mounted to your handlebar). Our shifter uses a micro DC motor to pull a standard shift cable which moves your derailleur to each gear on the cassette. The D1x Shifter is fully programmable so you have the ability to train the D1x to work with any number of gears on nearly any derailleur-cassette combination. All this happens through a simple configuration app on your smart phone. Set your shift points, configure settings, and then connect your remote to the shifter. Gone are the days of pull ratio and barrel adjusters. The D1x Trail Shifting System is simple to set up and easy to use!