In search of a surveillance camera, I came across this LTE camera from K&F Concept.

For me, 2 points were crucial:
1. the camera should be able to operate without external power source.
2. the camera should have online functions.

To point 1:
The K&F Concept 4g camera has a built-in battery. The battery can be charged via an enclosed cable. In addition, there is a solar panel in the scope of delivery, which can be mounted directly on the camera or on the house wall. In the past weeks, it was relatively sunny and the battery was always fully charged by the solar panel. I am curious whether this will also be the case in the fall / winter.
To point 2:
The camera has WLAN and a SIM card slot. A trial SIM card is included in the scope of delivery. K&F Concept offers cloud storage of the video material for a corresponding fee. The camera can also be connected to the WLAN and controlled and configured via the K&F Concept app.

The built-in motion detection activates the camera and sends a push message to the app. The camera can be rotated in the app, in two directions, 355°/ 95°.
Both during the day and at night, the camera offers good picture (2K).
The two-way sound is acceptable, but depends on where / how high the camera is mounted.

So far I am very satisfied with the product.