Review on ALPCAM 4K USB Camera Ultra HD 2160P Webcam with 5X Optical Manual Wide Angle Lens, 2.8-12mm Varifocal Lens, Sony IMX317 Sensor, USB Zoom Video Conference Camera for Mac, Windows, Linux, Raspberry Pi by Joseph Lang

Very good webcam. It has a USB port and is plug and play. I just plugged the USB into my laptop and was practically good to go. The picture quality is very good. Since the camera comes without a manual, you might not want to pay too much attention to the Revain site. I think this actually describes the adjustments in reverse order. I start with the ring closest to the camera body. You can use a small screwdriver to unlock it. Adjust it so that you appear in the image roughly the size you want on screen. Then adjust the ring furthest from the camera body to focus. You may also need a screwdriver to unlock it. Between these two is a ring that allows you to adjust the brightness of your image on the screen. I was annoyed at how gloomy I looked; then I discovered this middle ring. There are two things I'm not very happy with. First, the camera isn't attached to the screen. I had to buy a tripod for that. Second, the camera doesn't have a great depth of field. That means if I lean too far forward or backward, I lose focus. These are relatively minor issues.