Features 1.Designed for OEM equipment only. Perfectly fit for E Class 2017. 2.Simple and timesaving program, plug and play activation via OBD II port. No need to disassemble the radio. 3.Retain the functions of the navigation system installed at the factory for easy access to visitors. 4.Allows access to the Factory Bluetooth keyboard through the screen at any time. Allows to enter the navigation destination address at any time. 5.Real-time monitoring of the diagnostic sensor in the vehicle for faults, checking the readings can quickly perform maintenance work. Specification Item Type: OBD2 Fault Code Reader Material: ABS Color: Blue Fitment: Fit for E Class (W213) 2017 Navigation/Radio Compatibility: For Command NTG5.5 Systems How To Use: 1. Turn on the ignition switch, and the car audio is all on. 2. Activate the plug and play function through the OBD II port (under the steering wheel). 3. About 5 seconds, you will hear a "beep beep" sound. 4. The car audio will restart. 5. Unplug the OBD II port, all is done. Package List 1 x Fault Code Reader