How many mm meters I use to monitor the camera
3, the cash register camera is designed to monitor the behavior of the cashier or monitor the action of the payer? Because the installation of these two conditions are different, regardless of who to monitor, to be installed in the opposite of the monitor, if you want to see the face of the monitoring object, the installation should not be above the cash register, or as satellite images, Only to see the head, and the general cash register is installed in the side, both sides of the face and cashmere action can take care of, as to whether the hemisphere, to see your environment decided, in addition to the installation site, no principle difference.
Finally, it is recommended that you choose the camera, it is best to choose a manual zoom lens, so that after installation can be based on the scene environment for a certain range of adjustments, it is convenient.
4, non-infrared camera power is very small, four cameras share a 2A power supply is sufficient, if there is no 2A, 1A line, but the power margin is small.
1, on the issue of 1,2, the lens of the focal length of choice with their own experience has a great relationship, different people, different occasions require a lot of difference, I give you a map, you according to your own choice and monitoring object requirements Make a choice
