Yamaha ENG GYTR Communication Control Unit:

The GYTR Communication Control Unit (CCU) allows you to communicate with your bike via your iOS&reg, or Android® using the Yamaha Power Tuner App. Make fueling and ignition timing changes, while also monitoring maintenance intervals. Includes a free download of Yamaha&rsquo's CCU configuration apps to use on your smartphone, iPad® or other tablet – allowing riders to download their captured data from the CCU via Wi-Fi® to the app, where they can then analyze the data, make setting changes, and then upload those changes back to their WR450F Onboard Wi-Fi® system for the ultimate in track-side tuning Requires the GYTR Competition Kit, sold separately Uses the same components found stock on the YZ450F Light and compact Easy, quick installation process Includes all necessary hardware.