The motion detector emitted a beep as I stepped through the front door.

They came to the first motion detector, its red eye blank and dark.

You need a way of sending that motion detector data to the right place.

A panel beside it contained a motion detector to open it automatically whenever anyone approached.

Here was the light the creepers would need -butwhat would trigger the motion detector?

He figured he must have set off some kind of motion detector or alarm device.

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

The motion detector can trigger shots, or you can program it to do time-lapse photos.

Accelerometer A tiny motion detector that can measure how fast you're moving and in what direction.

If the motion detector is triggered, it will immediately send a notification to your cell phone.

Rushing to the cellar door, we found the motion detector flashing wildly in the dim light.

Moving down the sidewalk, we set off one motion detector after another, lighting our way in stages.

Someone had just tripped the motion detector she had placed in the hall on the ground floor.

However, this time I am going to get the acceleration with a motion detector instead of a video.

The guard turned off the alarm only to later spot one of the thieves through the motion detector.

Do you have a motion detector?