Can we talk about safety first?

An: For security purposes.

Defense: a means of protection

Be prepared and protected against attack or injury, so that the protected object is in a safe state without danger, infringement and accident. There is a process of awareness (risk perception and alarm), delay (delay accident time) and response (take action).

Talk about what is security system, camera, building intercom, smart home, gate bayonet, alarm, intelligent broadcasting and so on.

Talk about monitoring system, camera resolution, code stream, focal length, brand manufacturer, what is wide dynamic, what is low illumination and so on.

Talking about the evolution of the market, the initial simulation, digitization, digital simulation, networking and intelligence.

Talk about the differences between them, such as wiring comparison, clarity comparison, cost performance comparison and so on.

It's about uses, such as schools, hospitals, public places, judicial organs and so on.

Find some pictures online for PPT, which is clear at a glance.