The Flashcal is the ultimate calibration tool for the essential JK accessories. With Flashcal, you can now take full advantage of the most popular aftermarket upgrades available. Features Include: Corrects speedometer for tire upgrades between 26? - 42?. Speedometer recalibration for gear /axle swaps up to 5.38 and beyond. Transfer case Hi and Lo locking options (2007-15 Rubicon only). ESP stability optimization (2011-15 automatic transmission only). Engine idle adjustability for winching. Street legal TPMS adjustability (Off-Road options available for download). Daytime running light options (2007-15 models only). Radio delay options (2011-15 models only). Headlamp delay options (2011-15 models only). Horn chirp and exterior lighting flash options when locking doors with keyless entry. Reads and clears diagnostic trouble codes. Internet updatable.