was looking for a surveillance camera that can be used anywhere without requiring an existing WLAN network or a power connection and then came across this model from K&F Concept. It generates its electricity via a solar cell, which works quite well. A small charging light shows when it is charging, which is even the case if you hold it towards the window indoors. Thus, it would already recharge in diffuse, darker light, e.g. in the forest. Depending on the intensity of use, it should also be able to bridge several weeks without recharging via a permanently installed lithium-ion battery. Installation is relatively easy, everything you need is included, and a SIM card is already installed to get you started. I use it with an Aldi-Talk prepaid card, the cheapest data package there is EUR 4.99 per month. It is important that you initially insert an unlocked card without a pin code. You can access the camera (and multiple cameras) via the app that comes with it. You can make all sorts of settings, look at the recorded photos and videos or see a live image. The camera can be panned in all directions in live mode, and there is even a built-in microphone and speaker so you can talk to the camera on your cell phone (or tablet). So you can use the camera as an intercom system if you hang it on any entrance (eg the entrance of the allotment garden). Depending on how you set it up, it also sends an alarm to your cell phone when someone approaches it and records video and pictures at the same time. You could theoretically even hang it in the forest and use it as a wildlife camera that you can access live from home. It is also possible to activate a siren, then the camera acts as a simpler alarm system. The great strength of this model compared to the WLAN version is above all this complete independence from the existing Internet and electricity. It works anywhere there is a cell phone network. At the same time, it is small and inconspicuous and, thanks to the solar cell, has the advantage that it is absolutely maintenance-free. Once you hang it up, it works practically continuously without having to change batteries. So you can use them to watch the holiday home, the allotment garden, the boat, the horse paddock, the chicken coop, vacant properties, the caravan on the campsite, craftsmen could use them as a construction site camera to protect building materials and machines. Also suitable, for example, for showmen who travel a lot. You can also hang the camera on a tree in the forest to observe deer crossing, a high stand or a feeding station. You can also attach it anywhere and take time-lapse recordings. The picture quality is very good. I monitor part of my garden with the camera. The picture is good and sharp, both day and night. The camera has multiple infrared diodes that are powerful enough to illuminate a large area of the garden. The light of this wavelength is invisible to humans and animals, so the camera is also suitable for beautiful animal observations, you could even have it filmed through a hole in the lid of a nest box. But it also has 4 white LEDs that enable colored night vision. The light sensitivity in almost complete darkness is impressive. The resolution of the videos and pictures is 2K, it also has a 4x digital zoom. Images and videos are recorded on an SD card. There is also a cloud function, but you don't necessarily need it. The films and images stored on the SD card can be called up via the mobile network using the mobile app, for example, so you don't have to drive into the forest to evaluate the images and change batteries, as you would with a game camera. The data consumption is also not very high. With the cheapest prepaid data plan, you can use the camera for a few weeks. Unfortunately, it doesn't have a WiFi adapter, so it really only works via the mobile network, but that's also its advantage, because it works completely location-independent and you can quickly take it with you and hang it somewhere else. Access to the camera images can also be shared, for example if several people should be able to access the image. I use the camera mobile for various purposes and would buy it again at any time.