motion detector , auch: presence detector

You should also have a security system with motion detectors, just in case.

IT is one thing to build a motion detector for a home security system.

We've seen stores with motion detectors, and they have been able to get around them.

Which meant the motion detector passed, at least the safety test.

Active systems protect an area with some sort of motion detector.

The other would be for the motion detector on the gate itself.

"Have you got that motion detector in place, old man?"

It was just an alarm, some sort of motion detector.

After the war, he used that technology to create motion detectors for alarm systems.

"You missed the tests of the new motion detector this morning."

He picked the motion detector off the counter and turned it over in his hand.

"I can't use the motion detector with that thing wandering around in here."

Lee watched as the red light on the motion detector disappeared.

Above the walls were motion detectors and a video camera trained on me.

No motion detector on the fence that surrounded the place.

Could she reach it, activate the system, the motion detector?

"Won't they spot us with the heat or motion detectors in their radio tent?"

"And if they try to approach a window, the motion detector lights will come on.

Only one video camera remained, and the motion detectors no longer existed.

"Boy, I'd like to know where he got the motion detectors.

Something had obviously triggered the electronic eye of the motion detector.

"A motion detector reading, by the south perimeter of the fence."

With motion detectors, the researchers said, doctors can gather information several times a day over a long period.

Motion detectors have found great application in domestic and commercial applications.

It had to be some sort of passkey, like a motion detector.