That's not that hard to interpret. The super-indestructible (they must be made out of pure nanitetanium!) amulets simply send out a command in the immediate area that tells them to stop, with the software needed being found on the flash drive itself.
Why it takes such a special amplifier to boost the signal, however... <shrugs>
Not sure why they can't just copy the thumb drives either, but... it's all okay, yanno. Scientists!