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.

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

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

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

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

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

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

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

The motion sensor developed for those products is still in use.

Since they can't seem to see us on the motion sensors, we have to go all the way back ourselves.

Many of the lights within the school include motion sensors as well.

Looks like it's got a motion sensor on it, too.

The motion sensors were green boxes set about four feet off the ground.

Hopefully there were people close at hand and some sort of motion sensors.

The only way we can find anything out there is with the motion sensors.

"I think we can navigate by the numbers on the motion sensors."

Most motion sensors are designed with only a certain amount of sensitivity in mind.

"We have motion sensors all around the park," Arnold said.