Hidden explosives activator

• Concealed trigger
• Security alarm trigger
• Alarm trigger of a sort

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Another edges his way towards him ... picking through mines and tripwires. ▪ At first they were detonated by cables or tripwires. ▪ Booby traps were usually small and frequently made out of a grenade, with a simple tripwire attached. ...

Wikipedia Word definitions in Wikipedia
Tripwire is the third book in the Jack Reacher series written by Lee Child . It was published in 1999 by Putnam in America and Bantam in the United Kingdom. It is written in the third person.

Wiktionary Word definitions in Wiktionary
n. 1 A cord or wire arranged so that when snagged or pulled by an intruder, it will trigger a detector or trap or a device, such as a land mine. 2 Any means of detecting intruders.