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 Buick EnvisionMangoal Front 4K & Rear 1080p dash cam can fit perfectly behind the rear view mirror like original. No messy wiring exposed, no complicated rewire at all. Perfectly intergrated with Buick Envision 2016-2020 (Model A) vehicle styles, Such as Base, Essence, Preferred, Leather, Premium I, Premium II. 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