Recently I had to look into a duct/shaft in the ceiling. I didn't know whether there were pipes or power cables inside. I wanted to attach several heavy things to this shaft. I drilled a small hole and inserted the endoscope through it. Right to start I was very impressed that the camera (as described in the article) didn't have an auto focus, although I was skeptical at first, but this skepticism disappeared during use. The attachments are easy to change and are very useful in some situations! Charging is done via a USB cable which can be charged either via a power supply (charger for your cell phone) or a power bank. All in all, the endoscope offers the buyer everything you could imagine or expect for the price. Image quality is top,You can't be too far away or too close to the object you want to see. But thanks to the long, flexible and at the same time rigid cable, this isn't a problem. I'm giving 4 stars instead of 5 because the picture or... The transmission was often very jerky. But still a clear purchase recommendation! Oh yes, the connection of the smartphone (I Phone) to the device worked without any problems