The Flashcal is the most advanced, & yet the most easy to use, tool on the market for recalibrating the speedometer for JK Wrangler customers who have upgraded tires, gears or axles on their rigs. Flashcal provides a quick calibration solution to ensure the Jeep is dialed in properly. Now Flashcal owners can upgrade their unit to a Flashpaq online. A simple internet update can add award winning tuning straight to their device. ** This product has not been tested or validated on right hand drive Jeep(R) applications or imported (non-American VIN based)Jeep(R) applications. They are not supported by this product.Flashcal F5 Programmer Handheld TunerFeatures and BenefitsHigh Definition 2.8 Inch Color Screen Reads And Clears Diagnostic Trouble Codes Internet Updatable Increased Memory For Faster Processing Speedometer Correction For Changes In Tire Size/Gear Ratio Adjustable Axle Gear Ratio Adjust Idle In Real Time To Run Accessories Locking Axle Options W/Transfer Case In 4-Hi & 4-Low Exterior Lighting Flash & Horn Chirp Options TPMS Options Based On Fitment Headlamp and Accessory Delay OptionsFlashcal F5 ProgrammerWARNING CA Proposition 65: No