Please NoteYour car must have an Auto-Dimming Rearview Mirror Plug Power Adapter(10Pin square plug), otherwise, power can only be obtained through OBD or Fuse box. Parking monitor must have OBD Power Adapter or Fuse Box Power Adapter(asin:B0CXXXV4YG). Model A & Model BThe model A and model B match the same vehicle year and must be distinguished by the vehicle sensor cover.Seriously compare THE SECOND PICTURE and THE Third PICTURE. Custom fit for GMC TerrainMangoal 4k dash cam can fit perfectly behind the rear view mirror like original. No messy wiring exposed, no complicated rewire at all. Perfectly intergrated with GMC select terrain 2018-2024 (Model A),SL SLE SLT AT4 Denali Built-in WiFi, free AppThe built-in WiFi owns higher-definition and faster download speed, and the free user-friendly App makes it convenient to view realtime videos on your phone, download or transfer important footage to PC. You can also share videos on social media with friends or families