have been able to test a few security cameras in the past and can say in advance that I would place the K&F Concept surveillance camera reviewed here in the top ranking. The reasons follow. First of all, it should be emphasized that the camera can work completely independently. No external power connection is required. The camera battery is charged very reliably via a solar panel. How this behaves in winter, however, remains to be clarified. That's the exciting part. So far, for 4.5 weeks, it's been working perfectly. It saves me the hassle of drilling. The installation of the camera worked very well and quickly for me as a layman who does not have much knowledge of such things. Ideally, you should download the associated app onto your cell phone, which can guide you through the installation. Within a few minutes the camera was installed, aligned and ready to go. All recorded videos can be stored on an SD card (not supplied). You are NOT obliged to take out a paid subscription. You only have to complete this if you don't want to save the videos/transmissions on the SD card but on the mobile phone. The camera image is also transferred to the app without a subscription, you just can't save it then. But that's enough for me. I also find it an advantage that you don't have to remove the SD card from the camera to delete the recordings. You can delete all videos super easily via the app. If something strange should be recorded by the camera, e.g. burglars, etc., you can always remove the SD card from the camera and save the evidence. The camera and solar panel are waterproof, however I would recommend at least installing the camera somewhere under a sheltered canopy/eave, to be safe. How long the waterproofing will last is difficult to say with such cameras. I find the image quality to be completely sufficient, but 5k is definitely not. I don't think it's 4k either. So if you are looking for a camera that records high-quality, high-resolution videos in almost cinema quality, then you should rather keep your distance from this camera. However, if you want a camera that reliably monitors the property, that reliably registers movements and reports them, and if the image quality is secondary, then you are welcome to go here. Because the motion detection works reliably and extremely quickly with my camera both day and night. There is almost no time delay, at least none that I can measure. If the motion detection seems too sensitive, you can use the app to adjust it. What appeals to me personally is the fact that the camera automatically activates its own LED light as soon as it detects movement at dusk/night. This is ideal for deterring any nocturnal intruders, as this light is indeed very bright. At the same time, a corresponding motion alarm appears on the mobile phone and you can see in real time who or what is in the radius of the camera. I can say that I had no problems with the WiFi range. I feel they are exactly on the level of other cameras in this price segment. In the case of WLAN fluctuations, however, it is of course the case that the transmission delay also increases and the picture quality deteriorates. You should therefore definitely check the WiFi range at the selected location before the final installation of the camera. In conclusion I can say: I like this camera. It does what it's supposed to do: monitors very quickly and COMPREHENSIVELY in wind and weather, alerts immediately if movements are detected and transmits a good quality but ultimately not 5k video. All data is stored on an SD card, which makes a paid subscription to the APP unnecessary. The camera is self-sufficient in power from the solar panel. So why am I deducting 1 star? Well, the camera does what surveillance cameras are supposed to do. That very reliable. But: the price currently being asked for it is simply too high in my opinion compared to the competition.