Plug Play Car StereoThis car radio compatible with VW Passat Skoda Seat supports factory Air condition display factory parking sensor display factory steering wheel control factory door information display factory amplifier. Necessary cables supplied easy to install and no cables to cut.Fast bootonce put in car keyit will start up at once and enter into user interface in 2 seconds.It need about seconds in the first time boot upOptical Fiber and Coaxial Dital OutputIf your external amplifier has Optical Fiber or Coaxial Dital Input it gives you a chance to achieve ultimate sound quality directly.Builtin 4G ModuleInsert the SIM card for Internet access but it cannot support to make phone calls or send SMS. Support the below types FDDLTE B2/B4/B5/B7/B12/B13/B14/B17/B25/B26/B38/B66/B71. TDDLTE B41GPS NavationPrecise GPS engines more acte positioning including GPS antennas can better receive satellite snals thus ensuring faster realtime navation. Offline maps If you are in an area where downloading the data of google offline map is supported you can save the map data of that area to the car stereo in good map and use it offline. Synchronize mobile phone map data to head unit via Carply/ Android auto.