I have been using the Kingslim D4 for approximately 1 month in conjunction with a Samsung Pro Plus 256GB microSDXC card. I am only using the front camera at this time, and will install the rear view at a later date. I set the camera’s front resolution to 3840 × 2160 with a record time of 3 minutes per clip which results in a file size of approximately 415 Megabytes per mp4 video.Install was fairly straight forward. I bought some stronger 2 sided adhesive tape and stuck the camera mount / gps unit directly to the housing behind my mirror on my 2023 Hyundai Sonata. I got power from the factory wire harness using a Dongar Technologies Dash Cam Power Adapter 10-pin Type H for Select Kia/Hyundai and bought a smaller 9” cable “CERRXIAN 9Inch Mini USB Cable Combo Mini USB Right Angle & Left Angle Male to USB Type A 2.0.” The camera is built solidly and I like the camera’s design.Trying to use the kingslim app at my house was near impossible. You need to connect to the Camera's wi-fi like it’s a wi-fi router, and my phone kept detecting no internet connection so it would disconnect from the Kingslim D4 and re-connect to other devices within range.I decided to just pull the micro SD card, and plug it into an adapter on my PC. The file directories are organized very well, with directories for both front and rear view in each of the main directories such as event, photo, park, and video. The file structure seems to allocate space for both the front and rear camera, because after nearly sporadic use since installing it, I only have vide from the the last 17 days (used for 30 days) and the card has a total of 466 files in the directory. I have used 107GB and it says there is 131GB free. I believe the camera has already overwritten older videos even though there is still an abundance of space on the micro SD card.The first thing I noticed when trying to play the mp4 video file from the micro SD card, was that my PC was lacking a video codec. I received a pop-up message saying I needed a HEVC Video Extension that would cost $0.99 from the microsoft store. After purchasing the codec, I was able to view the files on the windows media player. The video quality is decent, but nowhere near the quality of a GoPro camera. The video image has a slight grainy look to it, but if you pause the video, you can still make out the license plates passing you at approximately 20ft away. Overall, it’s a decent image, but not sure how much, if any better than a good 1080p image with a faster frame rate. The image of night videos were pretty good, but with any camera, pretty difficult to make out license plate numbers unless they are close and lit up with your headlights. The microphone quality was pretty decent too, but may need to be turned up to catch people speaking softly.Overall, a nice camera at a good price. The video quality isn’t going to be that of a GoPro, but the images captured will definitely detail what happened in any accident / driving situation, etc.