A worthy upgradeReviewed in the United States on April 25, 2022
I'd like to first point out that I'm a bit of Vantrue fan boy, most of my dashcams recommendation to friends and family are made by Vantrue, and I have good reasons. My previous dashcam was X4 but decided to upgrade because I needed a rear cam, and X4S duo seemed like it would fit my need. In term of video quality and resolution, they both are comparable, and don't think one is better than the other. Features wise, X4S has upper hand, and you can now control it with an app over wifi. X4 was also starting to giving me issues and timestamp kept getting reset. After I received X4S, I upgraded the firmware right away, which was an easy process. You basically grab the firmware from Vantrue's website, place it on the sd card and connect it with USB power (not to a computer).I have my default resolution set to 3840x2160P@30fps because it's skipping frames with 2560X1440P@60FPS, probably due to the memory card. Something to keep in mind. I suggest getting the optional hardwire kit and GPS mount for showing location and speed. I also liked that you can set the rear cam to be the default view, and turn off auto screen shut off, it can basically act as a rear view mirror. Overall, I don't have much to complain just like their previous generation X4.