Feature 1Designed for OEM equipment only. Perfectly fit for E Class 2017. 2Simple and timesaving program, plug and play activation via OBD II port. No need to disassemble the radio. 3Retain the functions of the navigation system installed at the factory for easy access to visitors. 4Allows access to the Factory Bluetooth keyboard through the screen at any time. Allows to enter the navigation destination address at any time. 5Real-time monitoring of the diagnostic sensor in the vehicle for faults, checking the readings can quickly perform maintenance work.Item Type: OBD2FaultCodeReaderMaterial: ABSColor: BlueFitment:FitforEClass (W213) 2017Navigation/Radio Compatibility: ForCommand NTG5.5 SystemsHow 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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x FaultCodeReader