Developer's DescriptionBy Watchdog appsThe PHEV Watchdog App run's on an Android device and that has Bluetooth available.The PHEV Watchdog App run's on an Android device and that has Bluetooth available.If you have a location (GPS) this will add location and altitude data, but it is not mandatory in order for the App to work.You will also need a compatible OBD2 adapter so the App can connect to the OBD2 interface and collect data from the car.Check the website for a complete list of adapters reported to work with the App.