What should I know before inquiring about CCTV monitoring products

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Security products are different from household appliances, with a wide variety of types and suitable for different usage scenarios. Before inquiring or purchasing, you should understand your own needs.
Taking CCTV cameras as an example, before inquiring or purchasing, you need to ask yourself questions as below:
1. Is it used indoors or outdoors?
2. The focal length of the lens, which is the monitoring range.
3. Resolution, which refers to the level of clarity.
4. Power supply method, is it POE power supply or not?
5. The number of cameras installed, whether they are for household or commercial use, and whether they need to be connected to the security system.
6. The method of video storage, that is, how long the recorded video needs to be saved.
7. The way of networking, which is TCP/IP, WI-FI or 4G