Camera:

Cameras, also known as computer cameras, eyes, or electronic eyes, are video input devices widely used in video conferencing, remote, and real-time monitoring. Ordinary people can communicate with each other through cameras over the internet, engaging in audio-visual conversations.

2. VCR (Video Cassette Recorder)

A magnetic tape recorder designed for recording television images and sound, capable of storing television program video signals and later retransmitting them to a television transmitter or directly to a television set.

3. Monitor:

Also commonly referred to as a monitor, it is a display tool that projects specific electronic files onto a screen via a designated transmission device and then reflects them back to the human eye.

Switches:

Switches can provide a dedicated electrical signal path for any two network nodes connected to the switch. Common switches are Ethernet switches.

Router:

It is a device that connects various local and wide area networks within the Internet. It automatically selects and sets up routing based on the channel conditions and sends signals in a sequential order.