Understand your needs for camera
How many cameras you need depends on what you need them for. Do you need to install them indoors to monitor babies and nanny, or do you need them to monitor doorways or gardens? You must also think about whether you need to record, in which case you also need to buy a video recorder.
If it is a regular-sized apartment in a high-end community, then a burglar alarm is enough to meet the demand; if it is a regular-sized apartment in a downtown area, you need far more than the alarm. An outdoor camera will be more helpful for monitoring external spaces, such as gardens and backyards. If thieves can see that the camera is monitoring them, they will not dare to attack your house easily, especially when the surrounding houses are not equipped with surveillance equipment.
In addition, what functions do you want the surveillance system to include, do you want wired or wireless cameras?
Wired surveillance cameras require construction wiring, and some changes will be made to the building wall of the installation place during installation. These cameras should stay in a fixed position. When the surveillance cameras are moved, they need to be re-wired, which is very cumbersome, time-consuming, and uneconomical for home users. On the contrary, the wireless camera can be moved wherever you want, because it supports wifi wireless monitoring. However, their transmission signals may be interrupted by mobile phone signals or wireless networks, which will affect the quality of video transmission. Wired products have no such problem, and can provide higher resolution than the same wireless products.