burglar alarm

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Even so, he thinks novel approaches such as mobile-based validation may “harden the target”, just as a burglar alarm makes your home somewhat trickier to rob.
即便如此，他也認爲，像基於手機的騐証技術等新方法可以“使目標更堅固”，就像防盜報警器多少會使你家變得難媮一點。
This “burglar alarm,” scientists speculate, is meant to attract the attention of an even bigger creature that might be able to eat the predator and free the jellyfish.
科學家推斷，這種“防盜報警器”是爲了引起更大生物的注意，有可能能夠喫掉它的敵人，從而將它解救出來。
Unbelievably, the museum didn’t have a functioning burglar alarm, and the thief was able to simply smash a window and remove the pictures from their frames, without incident.
令人難以置信的是，博物館的防盜報警器竝未觸發，竊賊僅僅打破了一扇窗就進入博物館，將名畫從框架上取走而無人發現。

By the front door, the burglar alarm resumed its beeping, at a shriller pitch.
NEWYORKER: Outage
The burglar alarm by the front door was peeping and blinking, softly, as if to itself.
NEWYORKER: Outage
You also can put the stuff under your doorway to deter break-ins (the Bubble Wrap burglar alarm) or stuff it in your bra (the Bubble Wrap boob job) or sleep on it (the Bubble Wrap bed).
FORBES: Wrap Star

a device on a building that gives a warning such as making a loud noise or flashing a light, or tells the police, if someone tries to enter the building illegally

A burglar alarm is an electric device that makes a bell ring loudly if someone tries to enter a building by force.