Always active: The Non Deactivatable Acousto Magnetic Label
These permanently live labels remain detectable at all times even if swiped with a magnet.
Their primary use of this patented product is in security cases e.g. for razor blades, where the product is enclosed in a protective case which is opened at the point of sale and then reused for further product displays.
It can also be used for any other application where the product should not leave the store. The live tag will alert you to its illicit removal.