Wireless connection to your vehicle is simple, easy and secure. The APR Mobile Bluetooth Dongle connects to the vehicles OBD-II port and establishes a secure connection between the vehicle’s ECU and supported smart devices. The ECU must be loaded with an APR Mobile compatible ECU Upgrade to take advantage of all supported features in their fullest. Where supported, this flash is a free upgrade to existing APR ECU upgrade customers. The APR Mobile Dongle will only work for one vehicle. The app works on unlimited devices.