they can detect when or where someone is then when you look you will see who or who is not subbposed to be there
Earth's surface is a common reference point for detecting motion.
The Logitech Quickcam Orbit Af Webcam 2.0 Mp Motion Sensor is a nice option
The advantages of having a motion sensor light switch are helping the environment and security for your home. Saving electricity helps save the environment, and a motion detecting light can help scare off criminals.
It's called a "Motion Detector"!
the disadvantages of a webcam are that when you are picking ur nose then it is on and it is so grossssssssssssssss...
Probably the Logitech Quickcam 9000.
There are many places where one could find more information about motion detecting cameras. The best places where one could find more information about motion detecting cameras would be a store like Best Buy.
A Passive InfraRed Sensor (PIR)
Possibly you may be thinking of an online webcam app.
I HAVE THE SEEM problem!!!!!!!! >>> SONY vaio (motion eye)
Doppler Radar
No, flies have compound eyes like many insects. They are very good at detecting motion.