And about types of alarm devices to stop books from walking out the door.

It had an alarm device, that had not been set.

There were no alarm devices that she could see.

He noted that the door was locked, but not protected with an alarm device.

If you live alone, think about wearing an alarm device that will bring help in case you fall and can't get up.

Alarm devices are installed to ensure prompt evacuation of the students and staff through exits.

That released the alarm device in the dead-man switch.

It was locked but unprotected by alarm devices.

His hand jerked at an alarm device.

He walked to the driver's side and ran his hand around the panel and left front fender; there was no alarm device.

Speak openly-but perhaps it would be better if you got rid of your alarm device beforehand."

He sped faster up the stairs, but he kept a watch for any surveillance or alarm devices.

All sorts of alarm devices have been put in the house, and the ground for half a mile around it has been electrified.

Alarm devices are often outfitted with a siren.

"What I'd like to know is who rigged all those spooky alarm devices," Joe spoke up.

Heads turned and widely opened eyes stared to the walls and up to the ceiling where the alarm devices were installed.

They were entering a building equipped with all the most modern of alarm devices, but tonight they did not fear these mechanical sentinels.

Indeed, The Shadow suspected that the alley fence out in front was probably rigged up with some sort of alarm device.

This power was controlled by some form of oscillating mechanism, probably derived from existing bell-ringing or alarm devices.

The building was secured by fire detectors, a carbon-dioxide-based fire-extinguishing system, and a burglar alarm device.

Under pressure to put security measures in place as quickly as possible, the airlines are rushing to put cameras or other alarm devices on board.

The conductors are attached to an alarm device, which triggers an alarm when it senses this current.

Most vessels only carried one radio officer, and during the hours he was off-duty, an automatic alarm device monitored the distress frequency.

He'd rigged up a private alarm device guaranteed to jar him out of deepest slumber, which he left standing on the desk throughout his watches.

A special squad that responds to pocket-sized alarm devices carried by the correction officers also arrived and helped break up the brawl.