They will detect the movement – and in some cases body heat – and triggering an alarm if out of acceptable limits. Video camera

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Wireless alarm security system | Home Improvement

You can see the movement – and in some cases, the body heat – and trigger the alarm when outside the acceptable range. Camcorders.

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How does a Wireless Burglar Alarm System Works | Wireless Camera

The monitor includes an audio/video out jack, meaning you can hook it up to a VCR or DVR to record high quality color camera footage.

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Wireless Portable Video Baby Monitor with 2 5 LCD and Night Vision …

The cameras will connect to DVR’s, VCR, and TVs. In addition, you have automatic and manual switching capabilities between cameras, as well as color adjusting abilities.

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The Features And The Uses Of The Security Cameras | Life Info Zone.com