The XTEND app is used in conjunction with the Horizon XTEND feature on the Topcon in-cab displays. Using the XTEND technology, you can extend the user interface of your display to your mobile device’s screen. Get access to many of the Horizon software features directly on your mobile device, both within and outside the cab of your vehicle. Use your mobile device to perform calibration, diagnostics, tank fill and many other activities anywhere around your machine via the familiar Horizon user interface. A dedicated WiFi connection keeps your mobile device always in sync with the main display in the cab.