...operation. - Control by computor via RS-232 port greatly enhance product application. 100 alarm records available to automatically record the sensor alarm and video loss channel with time/date stamp. - Provides automatic video loss and alarm detection, products two different alarm...

...known as PIR passive infrared detectors or pyro-electric sensors In order to make a sensor that can detect a human being you need to make the sensor sensitive to the temperature of a human body Humans having a skin temperature of about 93 degrees F radiate infrared energy with a wavelength...