As far as the image quality is concerned, I'm quite pleasantly surprised. Often enough, such cameras only have a resolution of VGA, so the photos end up in the memory with 1920x1440 pixels - absolutely sufficient! The camera has already been used several times, one of which was under a server rack, where the classic thing actually happened: there was a small screw from a slot plate underneath. A second assignment was the inspection of a completely wild opening in the wall, through which a whole bunch of various cables ran. This breakthrough is located directly under the ceiling and is therefore difficult to reach without aids - see the attached video. In my opinion, the camera does a surprisingly good job - even in teamwork with the app, which comes with no frills. The areas of application are extremely diverse, including in the area of water/wastewater/rainwater I clearly see this camera as a good problem spot analyst. With a diameter of just under 8mm, the camera is really small enough to fit pretty much anywhere. I find this camera - and especially with this battery-free design - more than practical, as it is ready to use anytime and anywhere. The image quality is surprisingly good for inspections in various low-light corners, so I simply can't fault it. In my opinion, the price is far more than fair, I would even pay a tenner more for it and for the quality delivered - purely out of belief in the product. In the end, I'm absolutely happy to give this helper in an emergency 5 stars because, in my opinion, everything in the product promise is kept and a few expectations were even exceeded. I therefore see this camera as an all-round honest product and recommend it without reservation.