This Little Device

We called it a clicker.

More properly called the M75 firing device, it sent an electrical charge down the line to detonate the M18 Claymore mine, a hateful little device beloved of combat soldiers.  With a daisy-chain of claymores stretched across your front, you could create angst and anguish among those bold enough to cause problems in the wire.

Whether Infantry, Armor, Cavalry, artillery, or any of a host of other specialties the clicker is beloved of soldiers.

Of course, if you were walking the line, you learned to put this little device in your pocket, lest Private Snuffy got spooked and decided to test the efficacy of the explosives.