NOTE: this link includes 2 kinds of DVR, different DVR has the different functions, configurations and appearances. please check it carefully before bidding. The follow shows the discription pages of the DVR1, you can check it before bidding. DUAL CHANNEL FHD 720P Keep the original appearance of the car Hidden installation does not block the original rearview mirror ,quick installation in two minutes. do not touc the film, do not block the line of sight. ADAS FUNCTION After downloading the APP, please upgrade it via network to use ADAS function. The follow shows the discription pages of the DVR2, you can check it before bidding. 1080P ADAS DVR For Android Car Player USB Camera HD Imaging Anti-Theft Locus Management:Trajectory info function allows you to check the vehicle driving trajectory in a certain time on your cellphone. Parking location: Parking location function allows you to see your vehicle location,easy to find your vehicle,and you can set an electric fence for your vehicle,when your cehicle leaves the fence range,it will send an alarm to your cellphone. AI Security: AI Security function allow you to check the electric fence alarm, and also you can snapshot a picture from the DVR when the device is on to see what is nearby your vehicle, ( this function require you to buy a 1080P DVR from us).