ECRI connects to your vehicle using an ECRI wireless device, which allows you to see current calibrations and write new ones. Benefits: • Easy to read current calibrations • Writing new calibrations is fast and easy • Use your phone's GPS to calibrate your tire size/speedometer • Calibration history is saved for each vehicle, letting you see calibration history from all ECRI uses on your vehicle Vehicles supported: • 2007-17 Jeep Wrangler (requires ECRI device) • 2018-20 Jeep Wrangler (requires ECRI device and ECRI security bypass module) System requirements: • Bluetooth 4+ • Internet access (WIFI or cellular) • GPS (if using automatic speedometer calibration)